That can be due to or exacerbated by several things. One, make sure that you have her checked by a chiropractor. In small children the eustachian tubes out from the ear drums are parallel to the floor and sit directly above the top cervical vertabrae. If this vertabrae gets out of line, it can pinch the tubes and create backed up fluid. It is easily and painlessly fixed. Check for a chiropractor that uses an activator - a small handheld devise that gently moves the bones of the spine without twisting and crunching. It is much more exact than the old-fashioned "back cracking."
There are massages that can be done to encourage drainage. These are not only pleasant, they can be surprisingly effective.
Also, ear candling maighy be effective. I'm not sure about that, but it is worth looking into. Basically, it is the old-fashioned way of removing wax from the ear. You light a small candle, then blow it out and let the warm smoke drift into the ear canal where it softens and melts wax so that is flows out. I'm sure it couldn't hurt to try and it isn't painful or difficult.
Feel free to email me at <a target=_blank class=ftalternatingbarlinklarge href="mailto:akaeg@netzero.net">akaeg@netzero.net</a>. I might be able to help you find more information on these options or on other non-invasive options.