Sudden Deafness before last treatment of herceptin

[Cipher]

Right before my mom starting the last treatment of herceptin(1 year), on this 6th May, she suffered a sudden deafness on her left ear. Before this happened, she had a fever, not sure if they are relevant.

Traditional treatment doesn't help in the past 10 days, she is kinda losing heart.

I searched the forum but didn't find anyone has the same symptom, I post here asking help from you who may know how she can be recovered from deaf.

Thanks in advance.

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2010-6 BC on one side, first Chemo
2014-3 Found tumor on the other side, second Chemo
2014-4 Start using Herceptin