I totally empathise with you watermeadow, there is no such thing as “only” a dog.
However, it sounds as if these growths may well be benign, and you must be guided by your vet who will know best. So give your little dog the best possible life whatever the outcome.
That includes lots of walkies, treats in her stocking, some surreptitious nibbles of leftovers and a cheerful human . If you mope, she may well get stressed herself and of course she will have no idea why, so come on, be like your little dog and live in the moment live for NOW and let future worries take care of themselves.
Good luck! ?