B complex is good, 1/2 pill a day. I think you have to straighten the toe as much as possible prior to taping.
I'm adding
@R2elk To this, as he's our guru & probably the one to listen to 1st.
I had a bird w/a wounded toe and bought him pairs of birdy booties, size chicken, large. I did this to protect the wound from being pecked, so have not used them for crooked toes-but I saved them for exactly that reason. I can't swear it'll work, since I haven't used them for that, but it seems only logical that it would.
Looking at site now, it doesn't show size lg and recommends XL for guineas, and currently out of stock. Not sure if they changed sizing or what, but you could contact them and ask.- i think the standard chicken might be better? -at 4 months, she's not going to have as big of feet. They aren't cheap, but they are hand made and worth their weight in gold when you have any kind of foot issue.
The toes will be longer than your guinea's toe. Not an issue, you just trim them back so that her nails are free to grasp with.
I always wrapped him in a towel then leaned him against me to put them on. It's awkward at first but then you both get used to it. He had no problem walking,running, or keeping up w/the others -or chasing others- with them on.
Good luck!
*I bought multiple pr d/t open wounds so I could wash in between. You probably don't need but 1 pr and remove at night.
https://crazy-k-farm.myshopify.com/products/birdy-bootie-hand-made-in-the-usa?variant=28600137613390