Here's something I learnt about some vets and doctors even. Don't say she will be fine, it's probably not that bad, she seams to be getting better, mainly because I said this once to my doctor once and they will just think yeah it will be fine less work for me! XD
Yes, it really depends on what the tree is, from what I know oak leafs aren't good for tortoises, just to add on if it has fruit on it, make sure your tortoise can eat fruit.