Weird, I have trialed BAHA and I didn't hear any differences. Everything sounded the same as if the BAHA wasn't even working. I have 70-80db losses on left side and high frequency loss starts from 10db at 3 Khz then it just free falls to 75db at 4 Khz on my right side, they said the reason it didn't work because my better side needed to be perfectly hearing. But my losses are purely sensorineural on both sides.
Glad it worked for you though, I wish it worked for me but apparently I need to stick with conventional HAs.
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For the original question, maybe she needs CIs? But from the bone test, seems to me her actual loss is the one according to the audiologist. How is the bone test for her better ear? I'm not an audiologist but I think she would do fine with BAHA, my ENT said you don't need to hear at 4000hz sound to understand speeches. Speeches are mostly in the 250-1000hz range, cmiiw, though others said you need it to differentiate between same sounding letters. Maybe if she's old enough to try the BAHA band, you could give it a try since after hearing some stories about BAHA, it's a hit-and-miss. For now, maybe just wear BTEs? I know a girl who is profoundly deaf on both ears, she only wears BTEs, her speech is as expected from those who are deaf but she could understand me just fine. Also yea, look for 3rd, 4th, or even 5th opinion, also avoid doctors who are associated with hearing centers, they usually just encourage you to buy their products.