You offered engagement photography. She's not out of bounds to do this, this is what professional engagement photographers deal with regularly. If you weren't actually willing to give her a photography package, then you shouldn't have offered. If you're not up to par with what she wants in a photographer, you should have made that very clear from the get-go that you could only offer basic skills and minimal requests. She gets married one time- either be able to fulfill the gift you've offered or rescind your offer with an apology. I say this as someone who gifts day-of wedding coordination services to my friends who get married. I don't do this to boost my portfolio or to gain more experience (it's not a real gift if I were to do that). I do this because a coordinator is expensive and I have the skills, knowledge and experience to do it amazingly. I'm not tooting my own horn here, it's just to explain that when you offer a gift for such a once in a lifetime occasion, you better be sure you can pull it off.