D.M.
Could simply be that her ear infections/fluid are blocking her ability to hear clearly... tubes will help immensely. I dont' think the allergies are the issue - they may lead to more infections and blockage of hearing which can lead to speech issues, but not allergies alone. Also, many kids don't pronouce words well at this age. The tubes are a great thing to do with this many infections - good for you for getting them done.