She doesn't need to change it for the virus if it stays contained in the mask since it's coming out of her. So unless she's planning on kissing someone with the mask in place, there's not much point in changing it beyond maybe once per day for ordinary sanitation purposes. That's why they were saying at the time that the mask was about protecting other people from catching it from you. Of course as they learned over time the mask wasn't as foolproof as they first thought and how effective a mask was depended on what kind of mask it was and if it was being worn properly. Even still though, any mask was better then no mask. Oh and what I stated before wasn't a theory.so based on this theory . what about her mask ? how regular should she change the mask if this virus stays attached to material