Your daughters’ roommate has no obligation to talk to your daughter about HPV (never heard about HTV). HPV is an STD transmitted thought direct skin contact. Your daughter will not catch it by using the same bathroom.
Why would they use the same razor? Even if the roommate didn’t have HPV, you don’t share razors with people.
Disease, or no disease people shouldn’t be sharing toiletries.
Also just because she “Seems very unconcerned about it”,that doesn’t mean that she is not. You don’t know what’s going on in her head.
If you want to learn more about HPV do a web search.