It's a way to help her out of a difficult situation.
From a woman's perspective... I say you could be looked upon as a good person or not.
That's going to depend on YOU and how you conduct yourself on the day of the move.
One caveat tho, you mentioned, you'd previously asked her out. Did she say yes or no?
If you're going to help her move, help her move. I know you'll probably be looking to score some points, but don't press the issue. if you make her feel obligated to you for helping her move, she may secretly start to resent you, ...and far worse than seeing you as a sucker, ...she may see you as slime who takes advantage of a damsel in distress. Not all women are as blunt and straightforward with their feelings as I am. Infact, I'd say the majority of women keep hostilities and/or resentments to themselves and never express them, ...but man-oh-man do they ever let it simmer inside. They'll smile to your face, all sweet & charm, ...but inside they're seething. You don't ever want to get into that area. Don't press it.
Now Jake will naturally chime in and advise you to do the exact opposite of whatever I suggest.