I would probably call OOH personally, DS has had recurrent ear infections and when there is a discharge they usually prescribe antibiotics in our practice. If the drum has ruptured she'll possibly be in less pain now but calpol would perhaps help.
Also - taking her to the GP will start the process of deciding whether or not she would benefit from a referral to audiology/ ENT, even if she's not in pain now and even if it's decided to allow the infection to run its course (this happened with DS once when it turned out that he was growing something penicillin-resistant and the most suitable antibiotic was ototoxic).
Pet subject - DS has longish history of glue ear, currently in watchful waiting before final decision on surgery.
It's good that she's not in a lot of pain, the drum's probably ruptured then - I had that a whole bunch of times as a child and the relief as soon as the drum went was enormous. Will probably need antibiotics though, so get her checked out in the morning at least.