S.E.
I agree with Lilli in using the beeswax ear candles to get the ear all cleaned out. The doctor will probably not suggest this because it is a form of alternative medicine. Did you ask the doctor for some pain medication for your daughter so she can get some sleep.
When you put her drops in, have her lay on her side with her head in your lap and just have her lay there for a while letting the medicine penetrate and them do the other ear. Really let the medicine penetrate before putting a cotton ball in the ear.
We also use to plug our noses, hold are breath and try to push the air out. It sometime help loosen the ear because it pressure on the inner ear.
You may also want to try warm compresses or messaging right behind her ear lobe.
It can take a while to clear up depending on the severity. Have the doctor check that this does not turn into a yeast infection in her ear. You will also know if she says her ear itches. After it is cleared up make sure she wears ear plugs when swimming.
Hope she will be fine soon.
S.