just a ruff idea on how much it would cost to cover the whole wedding from getting ready to going home?? because a lady is doing it for free and i am inviting her as a guest, and i would love to get her something really nice because i no photographers charge alot.. i am so grateful and just dont no what to say..

It can vary so much based on experience, the type of equipment she is shooting with and how much (if any) post processing she does.

I would suggest that you look around at photographers in your area who have a similar amount of experience (or at least quality of photos) and see what they are charging.

Either way, I am sure that she will be more than happy with whatever gift you decide to give her, and if she is a wedding photographer (or aspiring to be one) letting her use your photos for her portfolio, and writing her a testimonial may be all the thanks she needs.