MB here. I don't use care.com, but if I did, I would likely read a lot of profiles and make a list of people I wanted to contact before responding to an applicant. This may require several viewings of an individual profile before contact.
So, perhaps it's a good sign that she keeps viewing your profile. It means you're interesting to her and could be making the list of nannies she wants to interview.
Good luck, OP!