
Going to a rescue where you can pair her with a friend would be a good idea. Take her along and let her choose.
Some guineas take a while to settle in to their new homes and relax, routine is good (eg feeding at the same time).
I don't put a house in for my newbies, but they must have somewhere to hide so a towel/cover over the end of the cage and a big pil of hay is what I do, but others will give them a house to hide in- your choice
Foods- naturally guineas eat grass, if you can't get this then a variety of good hays (or just one sort of good, clean, hay). Essential for a healthy digestive system and keeping constantly growing teeth worn down. Readigrass or other forage is good too.
Dry food- I use Cavy Cuisine because the size of pellets is good for piggies to pick up, it based on Timothy (correct nutritional values), fibre and Protein levels are good too. For younger pigs I use Perfvormance or Science Selective but as long as it doesn't have colourings (check the ingredients label) then thats a good start
Veg! A variety of, and little and often. I tend to leave out the fruits and roots as much as possible myself but they are OK to feed of course. Dark green leaves- Spring Greens and Kale are good as they need vitamin C.
Dill is gobbled up by mine as is Coriander. I don't give Parsley much as its got high Calcium content- though guineas need Calcium

Feed a variety of veg and you'll be OK
