Hey! I checked out the profile you made for her - and from what I can tell she looks absolutely fine, developed enough to be believable for me. I’m not too sure what you’re struggling with, but if it’s more about trying to really get a feel of her personality and what she might act like in a variety of situations, I’d personally suggest trying to put the character through several personality tests that lists that can list and explain expected behavior more thoroughly. I personally like Myers Briggs test the most, as it gives a pretty detailed biography for each personality type, and their average antics. There’s also enneagram, I haven’t personally played around with it too much, but from what I know it’s very similar.
If you’ve already got a really good grip on her personality, I’d suggest going through different kinds of writing blogs or forums - you can usually find Oc developmental questions. I beleive we even have (at least) one here on these forums titled “WWYOCD?” (What would your oc do?) These are usually the things I stick with, I hope they can help!