Honestly, I think you should just take her in. I want you to get the answers you need!
Take her in, tell them that she is much worse today - the worst she has been. Make it sound worse than it is if need be. My GP, cool guy that he is, would totally agree. At one visit recently he phoned the hospital while I sat there - warning me ahead of time that things were not as bad as he was going to make them sound - and pushed to get me in to see a cardiologist as soon as possible. The specialist he spoke to didn't think I needed to be seen urgently, and after hanging up the phone my dr was pissed at himself for not lying about which kind of heart murmur he had heard (to make it sound more serious). I commented on how it was f'ed up that he would have to lie to get me the care he thought I needed, and his take on it was that it was the specialist's job to screen to make sure the neediest got in first, but it was his
(my dr's) job to make sure that I was ok, and if that's what it took then that's what he would do. In this case it's your job (which you are doing an amazing job at mama!) to make sure your dd is ok, and so I officially absolve you of any guilt if you decide to fudge things a bit if you go the ER route.