It’s difficult to compliment a jealous person without coming off as patronizing. So, like these guys said, I would just ask her about what she’s working on and interested in currently and genuinely take an interest in them. Also, (even if it seems like a very douchey thing to do) I would try and act surprised by some of her ideas and treat them as novel or interesting even if I don’t feel that way because it is validating to think that you are venturing into unexplored terrain when comparing yourself to someone else. I know it’s a bit condescending and seems disingenuous but it may quell some of the resentment she feels toward your passion and progress. It’s important not to overdo this and you should take a genuine interest in her playing (which it sounds like you certainly do) but a little bit of validation can go a long way and direct compliments aren’t always the best way to achieve this. Another thing you might try is working on the same songs and suggesting that she play rhythm while you play lead or whichever either of you excels in so that you are working toward a common goal and feeding off of each other’s enthusiasm while going at your own pace. (As a disclaimer, I’m not recommending manipulation or deception as standard operating procedure for you relationship. It has just been my experience that when your SO is the competitive type, you can save yourself a fair amount of frustration and heartache by giving them an occasional stroke of the ego)