Ubud is gorgeous. It isnt as commercial as Kuta, or even Nusa Dua for the matter.
Nusa Dua is full of big hotel name resorts - the Westin is one of them. I stayed there once and it was a self sufficient resort with its own private beach. There wasnt a need to venture out into town unless you wanted to explore what it has to offer.
Personally, for a couple expecting a baby, Ubud is great. There are art shops, rice valley tours etc which are essentially the heart of Balinese culture. Check out this resort, the Alila, it is modern, relaxing and quiet. You will feel totally cut off from the world as there are no clocks or tellys in that hotel
Highly recommended! http://www.alilahotels.com/ubud
Alternatively, if you want to pamper her, head out to Jimbaran Bay and check out Four Seasons Jimbaran. Prices are eye watering, and it has a cheaper version down in Sayan which is just as nice. But Jimbaran is where all the up market resorts are, besides the Four Seasons, the Ritz is also here. You dont pay for rooms here, but your own private villas with discreet, quiet and great butler service.
Its also great for fresh and cheap seafood.