DD1 is exactly the same! That kid knows the sickness card will always work!
But a couple of months ago, she was telling me her ear hurt on and off for about 10 days. I finally took her to the GP when she woke up crying one morning and couldn't stop tugging on it. Poor thing. Ear infection and the GP gave her some ABs.
If she tells you she can't sleep on it, or she is pulling on it, putting her fingers in it, complaining she can't hear properly or you notice she is getting any other symptoms, I would take her, but given it is the weekend, I would take her tomorrow if you can get an appointment.