Hey, entirely possible.
If you're cooking from scratch can't you make up a pot on the side with her stuff in but leave out the meat/cheese whatever or give her portion when it's at the "vegan stage" of cooking before adding what everyone else has and serving?
And for takeaways, a lot of places can easily leave out whatever you ask them too (main things being cheese, mayo, seafood) ask for it to be made without.
And as for her wanting vegan toiletries you can get a large basic, all natural formula soap base castile soap online from online such as eBay (Dr.bronner's for example in many different scents) and it can have MULTIPLE uses so, to wash her hands, hair, whatever washing liquid needs and it's entirely plant based and a little squeeze goes a long way, you would need to remind her not to overuse it or she'll be needing a replacement every week, it should last a good almost 2 months.
And as for vegan clothing, to be fair they are hard-wearing and last a long while, you should look at vegans on YouTube, [The channel Durian Rider comes to mind] in their faded gear, to be fair they really over do it but my point is it's long lasting.
And you could get her a wooden straw chair, a little pillow or rug, or blow up chair (just some quick, cheap ideas) if she won't sit on the sofas anymore; all you can do is just try the best you can to support her, if you can't do something then let her know or ask her to find the cheapest most eco way online or wherever of doing it.