Ordering from her will help her to make a living and support herself and her family. I will always order a good portion of prints from my colleagues even with the disc in hand. Also, ordering from her insures that you will receive quality
prints as it's likely she uses a professional lab. You can order from a cheap lab but they will not guarantee the quality - she likely will (I do, I have a 100% satisfaction guarantee or your money back).
Sharing the link with your friends and family is also a helpful way to get her some orders rather than being responsible yourself for printing for everyone.
Figure a dollar amount you are comfortable spending with her and any amount will likely be appreciated.You're not obligated but know that every bit helps nowadays with our services and respect for what we do is being put on the back burner.