I am pretty sure my two have had hiccups before, I know what you are describing sounds like what they were doing, but I can't recall if they had been drinking or playing before they got them or not. I know they don't seem to get them very often..

but another thing they do that has alarmed me is like.. suddenly sucking in their breath and then letting it back out, and they do it for a couple mins and I'm not sure why.. but I don't think those hare hiccups. I remember the collies doing it on occasion too though and wonder if maybe they just had some irritation in their nose or throat.

Maybe at least call your vet's office, and describe to them what you have seen and ask if they think she should be checked out? It's so unnerving when little things go on with our dogs and we have no way to know exactly what's going on.