I am sorry to hear about your granddaughter and I hope she makes a good recovery.
For sure brittle bone disease needs to be considered - especially as she may have a hearing problem - this is found in about 40% of cases.
There are different types of brittle bone disease severe to mild.
Her history would fit with "type 1" which is the mildest form of the condition.
Other features would include dental problems , leaky heart valves and a blueish tinge to the whites of the eyes.
You can read up some more on the link below.
Please get back to me if you need to chat some more.