I recently obtained a female albino hedgehog from her previous owners. They weren't that fond of the hedgehog and didn't socialize her well during the ~8 months they had her (they got her at ~1-2 months of age). They didn't take her out much, didn't play with her - basically, she stayed in the cage 99% of the time with them.
So, the hedgehog is ~10 months old, hasn't been socialized well, and is quite aggressive towards me.
I have had her for 2.5 weeks now. During that time I took her out every evening (after she woke up) and let her get used to my presence, noises that I make, etc. She spends about an hour outside of her cage, mostly playing freely on the sofa. For about 20-30% of the time, I try to interact with her by picking her up, trying to play with her. Every time I take her out, I give her a treat that she likes and eats eagerly.
Although she became slightly less aggressive for that time, she is still quite easily startled by me, doesn't let me touch her at all (unless I have picked her up forcefully), and mostly curls up into a ball when I am holding her.
Is this normal behavior? Can I expect the hedgehog to become more accustomed to my interaction if I continue trying to socialize her? What time-frames could I expect for a change in the behavior?