Hi! So fun trying to figure out what is going on with your kids, right? So, a possibility is simple ear wax. Even if fluid like. Since she also has fullness, perhaps that is the case. I'd make sure to use the debrox wax drops to see if that helps. However, that it is just one ear makes it less likely in my opinion. I do think you need to see her doctor and possibly an ENT. Has she had any trauma to the ear drum? Like a q tip stuck too far in or anything like that? She probably doesn't listen to heavy metal through ear buds at high volumes, right? :>) (I do). (kidding). Swimmer's ear definitely can cause ear leaking like that but was she swimming all these five months? And my knowledge of swimmer's ear is that it is pretty painful. I guess everyone is different.
Since this is yellow fluid, has been going on for a while, yes. Definitely see the doctor. They may just want to wait but under their guidance, hopefully you can get this cleared up for your daughter. When is the appointment?