I wouldnt ask her I would tell her you have some free time on a certain night and she needs to meet you some place for a half hour or an hour but then you have to go take care of some other stuff. If if she starts to say she cant you have to interupt her and tell her that day is no good for you, I over looked something I have to take care of. Then you can ask her if she has any thing open on another day of your choice. If she says she does then tell her a certain time and ask if you are putting her down in pencil or pen. If I put you down in pen that means your going to be there other wise its going to be pencil so that my schedule is still open. It puts a FTC on it, kinda like a mini date. This is something I picked up from David D. You have any idea where your going to take her?
