Imho, there is no harm asking for it, as long as that's polite. There are several stages of her service..legit massage, legit with HE.. So, who knows what else? What's the harm in asking as long as it is not a push..
She also removes the lingeries on request, not spontaneously. You have to ask her for that. So..I guess it is absolutely fine to ask her 'what else, if at all?' She has the right to say 'yes' or 'no'.