Patience IS of the utmost importance!! One thing NOT to do is say "it's easy". Easy for whom?
It's a whole lot better to give a description of the area, or of a place you are going into. Example, you are going to pop off from some riding that has been basically trail, and up through the trees into a bowl or onto a ridge. Instead of saying "it's easy".......follow my track (and don't leave her a trench), there'll be a curve.........some tight trees....a bump....hard right when you reach _____, etc. Something descriptive helps her to prepare mentally, and know what to expect instead of finding herself in something suddenly that scares her.
Yes, there will be always be things that can cause one to be uncomfortable, but knowing the conditions is a lot better than being told "it's easy" and then finding yourself in a spot that scares the bejesus out of you. You will have lost a lot of trust, and then from that point on, if she hears that........it's going to bring back the bad memory (it'll forever be associated as being bad). You might need to go up first, then come back down so you can give the description (which will also give her an easier track to follow).
Watch her....yeah, you're out to have fun too..........but keep your eyes on her. If she gets stuck, be right there to help her. When you're at an area she is comfy with, let her play around there. Nice little bowls with some trees (not tight) are great (and not steep). She can cruise around in there, and practice on things. I know I found one area, that for me was the best place ever.........and for awhile, that was an included stop every time we were anywhere near that area. I practiced going down a gradual incline, through the trees. The hill wasn't too big, so I spent some time climbing that.......I also used it to practice my turn outs and sidehilling. Once I was comfortable going downhill through the trees, then it was time to go uphill through them. Pretty soon I was zigzagging all over picking my lines up and around them, and flying up them.
The hubby played some there, but he also sat and watched me. He took video or pics. That's a wonderful tool in itself. It lets her watch/see what she was doing.....and its also great for future to see the progress made. If I got stuck, I didn't have to wait around for him to get to me. I still call the area *my playground*, as it was a place we went to MANY times, yet one that helped me to build my skills and confidence.
Sometimes we don't want to hear
at the time what we did wrong. We get frustrated, or mad at ourselves.
We can learn from our mistakes. Telling me that I hit something wrong, well.......I may have already figured that out and didn't need to be told (which can come across as a put down). Other times, I might ask. A good thing to do after the ride, is to talk about it. Like when home while having dinner or a beverage. Praise her for things you saw she did well at (and praise her doing the day).
Discussion about the day accomplishes a lot. If she had been wondering about something, she will most likely ask then. Having a talk about how good the day was will bring those things out. It is now a *safe* time to reflect. It's a good time to look at the pics together, or video.
It helps to do some rides with just the two of you. That way you aren't tempted to run off with the guys, while she feels abandoned. When we started to ride with others again (we went through some rough times to begin with, so it was time to step back and get it right or not do it at all).......we were careful about who it was with. Obviously it shouldn't be the guy that yells at his wife/SO. Other people's patience can be most helpful as well. There is one in our crew that I grew to really trust, so I didn't mind following him as well.
There were times when he would sit down going up a hill (and he NEVER left a trench). The point on that was to show me that this wasn't something that was going to be difficult, and he's just puttering up it.
Once I learned that from him (by watching then judging it for myself as I went there), it then left the choice to me....ok, so this isn't bad, and it's not something to worry about it.
Sounds like you have a great attitude about this, and that will get you far.
Having your SO as your riding partner is an incredible thing.