Thank you for your responses. :-)
Up until yesterday, my mom did not have useful hearing in her left ear. Dr. Brackmann (The House) said that she had lost >80% of her hearing in that ear. Weirdly, my mom's ear felt "itchy" yesterday, so she cleaned her ear with a q-tip. Blood appeared on the q-tip, but weirdly, my mom also felt the sensation of something like a sponge coming out of her ear. Like when you have water in your ear and then it drips out. Now, that left ear is a lot better and she can now use the phone with that ear. She said her hearing is a lot better now, although compared to her good ear, what she hears through her left ear is, in her words, kind of "muffled."
Any theories? I'm really bewildered now. The MRI showed that she has a 2cm acoustic neuroma or meningioma (the report says she may have one or the other, although it is statistically more likely the mengioma). My mom met with Dr. Brackmann and was all set to have the TL surgery on Feb. 9, but now she's not sure if she wants to lose her hearing or if she even has a tumor.