My son is two and he drooled A LOT at that age--I pretty much kept a bib on him at all times because his clothes would get soaked! This way I would just change the bib when it got really wet instead of having to keep changing his shirt.
He's only had one ear infection--which was around 8 months-and I've never heard of a drooling/ear infection correlation. I think some kids are just more prone to drooling and/or ear infections.
Once your daughter is 6 months old, you can start giving her baby Motrin which lasts longer than baby tylenol and I find helped a lot more. The orajel did NOTHING for us too....but the homeopathic teething tablets seemed to help when he was actually cutting the teeth (when the gums were are swollen and red). I've heard mixed things about those too though.
So I wouldn't worry too much about the ear infection--if she does start to get them chronically or can't get over the one she has--tubes is always an option and a very easy procedure--but really nothing to worry about with just one infection. I hope she feels better soon!