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As long as the battery bank supplies sufficient power continuously, it would certainly power it! If it doesn't, you'd have to look at a battery bank to power the device but I'd bet your daughter's noise machine is likely going to work fine on anything.
However, skatrek47 brings up a good point: The battery would need to just be powering the machine (unless you had an automatic cutover, but that seems like overkill for this application).
For your use case, I'd say just run it off the battery all the time and charge it once the battery gets around 20%.
There's USB batteries that'll do passthrough charging too, but keeping a battery charged all the time will kill it, so you might as well just use the battery.
If you wanted to go nuts, you could get an APC or something but that would be pretty silly for this.