Some providers of bodyrub and private viewing state on their website that no full service is allowed.  In this context, is DATY considered full service?  Is it appropriate to ask such a provider if she offers this?

I think you will find there is not agreement by all providers on whether DATY is or is not included.

The ladies that I've seen that advertise "No Full Service" don't allow it.

I would not consider DATY to be FS. FS is generally considered to be intercourse. That said, the offer of DATY will vary from one FBSM provider to the next, and even possibly by your relationship with that provider.

All you can do is read reviews, if available. After that, get in there and see how it goes. Unfortunately, asking beforehand would be a no-no - asking for a specific service.

However, once you have seen her and established a level of relationship you should be able to ask.

No at least not for me...shan't speak for others but usually if she does offer it i'd like to think it'd be on her site if she has one. For me FS can include mutual bodyrub, oral from me to him, a dance even, mutual masturbation, and what I call "sekzinthefront".