This sounds like what my daughter had. Hers was called a Delaire mask but she had it for a lot longer than 6 months (more like a year). She put it on when she went to bed at night, and she really didn't have too many problems with it. It sometimes twisted round her head a bit because she tosses and turns a lot in her sleep but most of the time it stayed fixed pretty firmly.
The bar across her forehead had a leather backing to it and that could get a bit sweaty: it had to be professionally cleaned a couple of times. Oh and it (the leather) started peeling off once and had to be stuck back on. Nothing too dramatic.
I think you have to be sure it fits properly as you can get pressure sores but we never had any trouble with that. The mask itself didn't seem to cause too much pain -- that came more from the expander, especially when turning the key, but she coped OK with OTC pain relief given half an hour before, and the key turned at bedtime.
Obviously getting your daughter to wear the jolly thing in the first place depends entirely on her co-operation. Fortunately my daughter was fine with that and even wore the headgear at sleepover parties. I think she enjoyed the novelty value!
Hope that helps a bit, and that your daughter gets on just as well with it
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