Lizzy, replacing the screen is the only thing you can do, but I'm afraid it's a big job and not something to take on if you aren't confident with phone repairs. Here's the iFixit guide showing you how to do it; as you can see it's fairly difficult.
Samsung Galaxy A03s Screen Replacement - iFixit Repair Guide
Accidents happen; I've lost track of how many screens I replaced on my grandchildren's iPhones and I never once yelled at them or got mad because one got broken. I think your best course of action is to own up to what's happened; explain to your mom that it was an accident and see if there's something you can do to help get it fixed.
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