
Quite normal, it is more like indigestion, hearburn than morning sickness. Her organs are being squeezed, and makes her feel sick.
are you still feeding her all in one meal. Now is the time to give her meals like a puppy, say 3 or 4 a day. You may find she will refuse to eat one minute, and be ready for food in an hour or two, so splitting meals helps with this too. Make sure she has plenty of fluids, but I would hazard a guess, that there isn't a huge volume of sick, it is mostly froth and bile!
Welcome to the worry that is breeding puppies. :D