1) How much of the basics of the craft do you know before going into this? Without the basic knowledge you may find it more likely to backfire?
2) Are you certain you want to cast a love spell, it is a grey area, it goes against some ones free will. If it works, she may love you, but it isn't her choice and do you really want that?
3) Are you certain that this cannot simply be solved by talking to her? A spell is not always the best option, especially a love spell.
I don't want to sound cynical, I just want to make sure that you are sure before going into this.