She sounds like a nice person who has tried to help you and actually did help you. I think she has just chosen to be a bit selfish and concentrate on herself.
You said it yourself, you felt jealous and your cheerfulness was not sincere and it started to bother you. I think it's a mature decision to cut some people out of our life even momentarily sometimes. It can be hard to care for herself and others at the same time.
I was very supportive of family members and they just kept complaining, whining about their life without a break and without caring in return. When I started to have adrenal fatigue and feeling tired all the time it was just too much to take so I didn't have other choice but cut them off of my life, and honestly I really feel better even though it was hard.
Give her a bit of time, she will be thankful to have an understanding friend like you.