Anxious Hamster?

[AxisOkami]

Hi all

I'm busy caring for my boyfriend's winter white hamster, Sunny, while he is gone on vacation. My boyfriend has owned multiple hamsters in his lifetime.

I myself own a winter white named Pepper (my first hammie), but these two hamsters are like night and day. Pepper became tame quite easily and gets onto my hand of her own choice, as well as coming out of her nest when spoken to and such.

Sunny is a much different story. She is older than Pepper by a few months, as my boyfriend got her roughly 2 months before I got Pepper, and I got Pepper back in August. Sunny was really small, even for a dwarf hamster, but now she is a tiny bit bigger than before. But ever since my boyfriend got her she has been skittish. She rarely leaves her nest and if she is exploring her cage and notices you, she will dash back to her nest and not leave for an extended period of time. She's done that when at my boyfriend's house and is continuing that behaviour at mine, despite being with me for over 2 weeks now. I've tried taming her but any attempts to pick her up causes her to squirm and fight her way out of you hand.

I was wondering if she might be suffering from a type of anxiety, or if anybody here has any good taming tips? Right now I spend some time just talking to her to get her used to my voice and give her peas (she goes insane for peas) to get her to come out of her den. She has been showing some progress, like sticking her nose out of her den when being talked to, but she still runs away when you try and touch her.