Suggest you do a search on the web, or maybe just on Youtube for fiberglass repair. That can probably be patched in fairly easily.
Since the shower dome is compromised, I would order and install a new outer one. They aren't that expensive. Thieves broke both outside and inside domes on my previous coach to gain entry. Found nothing to steal, but left me with a repair job that turned out to be not that hard to do.
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