Urgent advice

I rescued a stray last week. We thought we were ready, talked for months, have everything planned, but now I’m thinking way too much.

She’s a Pittbull mix, part staffy assumingly but we don’t know. About 4-5 months old.

We live in an apartment so she’s exposed to a lot of sounds and all but she’s shown aggression with food (trying to bite), and towards other dogs (when leashed she will bark and growl)

We took her to training last night and she was biting the trainers knees and pants (not locking down but open mouth grabbing on)

It seems everyday the aggressive tendencies are getting worse

We live in an apartment as well so avoiding contact with other humans and dogs isn’t possible. We also plan to have children one day.

The shelter did not tell us any of this. Explained pretty much the opposite. But I know puppies change quick.

She seems very very smart, picking up on commands very quickly, but her reactivity is intense and I don’t know what to do about it

I truthfully love her SO much. But I don’t know if it’s safe or healthy for me to be her owner. What do I do? I need serious unbiased advice.