Hi and welcome!
Skinnies are amazing, I have a little boy called "Little Man" he is gorgeous.
The spray you want for her skin is called Humilac, this is the one that
@helen105281 recommends! I got mine from ebay here :
Use it as and when her skin feels dry
I would definitely take her to the vet as there maybe something they can do / suggest to help her feet, it isn't normal for skinnies to have clubbed feet.
Also she will need a friend so she doesn't get lonely, human company whilst guineas do enjoy it, is no substitute for a guinea friend. Skinnies can live very happily with hairy friends, so you wouldn't need to get another skinny. My skinny has recently made friends with a lovely little fuzzy hairy boy and they are very happy together! You will need to find a friend who works well with her personality, if in the uk there are lots of rescues where you can take your girl and they will find you a personality matched friend for her. There is a locator you can use below :
http://www.theguineapigforum.co.uk/pages/guinea-pig-rescue-locator/
I also recommend you get some snuggle sacs or fleecy beds for her so she can climb in if she feels a little chilly you can find these on ebay or there are lots of shops that sell them on the internet. you could also make one yourself. I have made numerous bags / beds and I cant sew in a straight line and they still work out lol!
let me know if you want links to how to make DIY bags / beds and ill get you some
Finally welcome to the forum and I hope you enjoy it here! If you want anything give me a shout!