Release of a almost "domesticated" fledgling blue tit?

Hi! So over the last week I have saved and helped a fledging Blue tit. She was attacked by cats but was still okay, we took her in and have fed her and looked after her. For a little while we thought she wasnt going to make it because of her wing and her head (held it nearly upside down a lot?) But over the last couple days she has magnificently improved, wing healthy and head straight up. Now she is flying beautifully but obviously not as long or as high as normal birds. My question is, would it be okay to release her? Would she be able to fend for herself? She eats mealworms out of a blue small lid but obviously associates the blue with food now. We wouldnt do it until she can fly perfectly but I just need to know if it would be safe for her after being I guess almost domesticated? Thanks :)