I'd say keep it simple.

She's asked you to help her move. If it's something you don't mind doing then go along and help her move purely because it's a nice thing to do. It will help her and it may lead to a nice chat and getting to know her more. Or not. Don't worry either way.

The very fact that you agree and turn up will show you're a friendly reliable guy. Worst case scenario is she's using you purely to help her move but then that is precisely what she's said so it's not like she's got a hidden agenda or anything . So it's a no lose situation as far as I can see. As long as you go into it without any expectations then you'll be fine.