aww essbee - ds is 5 and a half (the half is VERY important!). I agree with the others, if it is an ear infection, it'll probably get worse tonight when she lies down (if she does scream in the night, sit her up - the pressure on their ears when they lie down always makes it worse).
I'm weathering the storm with ds as he is very very congested and I think that is making his ear worse rather than it being necessarily a genuine ear infection (and I know from dd and her ears, that the doc wouldn't necessarily prescribe the antibs anyway!).