What will happen if someone uses a dildo too much?

My female friend has one, but she’s been using it for around 3 years and at least 1-5 times a week. Will anything happen to her if she secretes to much “white stuff”? What’s in it? Should I tell her to stop? Will she be infected with some kind of disease or something?
Oh yeah, what can help her have an orgasm? She always tells me she’s doing it a lot she doesn’t usually feel the orgasm anymore.
Will this affect menstruation too? She only has mense around every 3-4 months as of now.