That figure seems high. I suppose it depends what you call an STD. For example, cold sores = herpes = std?
I would talk to your daughter about respecting herself and loving herself and keeping herself safe.
Condoms help, but they are not a guarantee. They can tear, and they can't prevent genital herpes and warts 100%. Explain to your daughter that the only way to be 100% safe is not to let her genitals come into contact with anyone else's, and not to kiss anyone who is visibly sick or has sores. (though you can still get mono from someone who is not visibly sick)