I so wish I could just diagnose her for you and tell you to give xyz, but...
I mean, if it's gas, Gas-x or Mylecon can be given, but I can't say to do that...
Pain drugs can be used to keep her comfortable. Again, can't tell you what to use.
If the bloating continues, an xray will be needed.
i'd say call one of the techs, but they should not be directing you to give drugs either, so that may not do much good. Sometimes ER vets will give adivce over the phone. You could try that.
On very rare occasions, small dogs actually get gastric GDV (true bloat). the symptoms would almost certainly be much worse than this. But because it's still theoretcially possible that she is bloating up, that's a slight concern. If it has continued, I'd just call the ER and see if they will advise. But please don't be toooo worried.