Hiya, I have a lil girl and she is super fast! I wouldn't say she is aggressive at all but then again she isn't WC, however the pet store I got her from had not handled her at all so after the initial couple of bites after transporting her from the store to her new home she's never even attempted to do anything of the sort since and she's never musked me or Mark to my knowledge.

I get Lola out every day, so I wouldn't let the fact that she is female prevent you from doing the same :P obviously give her a couple of weeks to settle down in her new environment etc. and she should come round I'd help more but I have no experience with WC garters but there are loaaads of people on here that do so I'm sure my advice will be bettered in no time