You might wanna rinse and gargle your mouth with mouthwash/ coconut oil and borax as its a fungicide.
You need to buy your girlfriend yoni pearls / herbal tampons which are to use to treat yeast infection. https://www.vgoddess.com/
These candida is very normal in women however it can get out of hand and caused imbalances.
This is for your sanity and future sex with her.