How sweet of you to support your daughter. I have been a vegetarian for almost 20 years now, and I'll tell you it meant the world to me that my mom supported it. She loves to cook so she just said it was an excuse to buy new vegetarian cookbooks! But it really meant a lot. (as opposed to my MIL who would make a pot roast and serve us the potatoes out of the pot with meat juice- seriously.).
I'm married (he's veggie too) and our daughter is 10 and is as well. Anyway, here's what we do. For a few years, we made a 'no turkey turkey'. It's basically seitan (which is 'fake' chicken/turkey tasting item made of wheat) cooked with veggie gravy, the covered with veggie stuffing, all covered with puff pastry. It sounds like a big pile, but once done, it's a lovely presentation. It's not hard, but it is time consuming. Go to allrecipes.com and search no turkey turkey, I think it's on there.
Lately, we get a Quorn roast. Quorn is a brand of all 'fake meat' items. This one is something of a log and it SUPER easy to cook. I just bake it and slice it like turkey slices. Also I get or make vegetarian gravy. I usually cook for my whole extended family and I just don't have time to make the fancier stuff anymore. But this is so tasty. Not sure where you'd find it in Texas- we have it at Whole Foods or Vitamin Cottage here, even the grocery store carries some of it.
Otherwise, at the health stores you can sometimes find the whole meal all ready and frozen- like a 'tofurky' meal. They are pretty good, too.
Bottom line, you can go as simple or fancy on the fake meat as you want (if you want to do fake meat). If you want her to eat stuffing, best to make it yourself as most stuffing is made with chicken broth. Same with gravy.
I will tell you that people may be curious about some of the different items, but don't expect most to like anything 'fake'. But that's ok. It does take people time to get used to it, and sometimes the jokes are annoying.
I know there are recipes for things like lentil loaves, etc. I honestly haven't tried those. That's a big leap of traditional food that we weren't ready for, but if your daughter is- then there really are plenty of interesting recipes to try.
Please let me know if you have any other questions. We have done Thanksgiving many different ways over the years to see what works best, so I'm happy to share!