Jennifer,
I believe that you'll be able to raise your pitch. Back in my senior year of high school, I used to sing tenor 1 part for quartets and in regular chorus. If you can practice religiously on pushing your voice higher, you'll get there. The best time to practice is in the morning by singing scales to warm up. Start on a comfortable note and end on a note that's a little to high. If you push yourself to hard to sing notes you don't have, you can damage your voice. So take it slow. Usually singing can translate into you regular speaking voice. If you don't practice every day, you'll loose it. I did unfortunately but I'm practicing again. I know the original question was about you looking into getting voice therapy but that tid-bit will help you along the way.
Good luck to ya!