ALORAIR 600 CFM Air Mover Blower Fan for Industrial, Workshop, and Home Use - 3 Speeds, 5 Adjustable Angles and Daisy Chain - Ideal for Water Damage Restoration and Plumbing - GF600A Blue

Mold woukd be my first concern with an elderly or young child in the home. That means that you need to dry this out completely. Inorder to do that, the shower stall walls need to come out and a cheap blower fan from amazon https://a.co/d/03jyR1X7 would do the trick. Next, if you have never built a shower, call someone who has. There should be backer board behind that flimsy side you were pushing on.