She doesn't because it's not a business issue for her. She is not getting paid when you sing her songs with your friends too and this is also not a problem.

I'm not thinking from the current definitions of right and compensation structures and I'm not calculating fees here. What I say is that if you build your thing on top of other people's work and put them out of business this needs to be addressed because you will cause huge problems to the people who made your machine possible in first place and you will dry up your source of "inspiration" because you will no longer have people making living of it.