First off, you are wonderful! I’m so happy to hear that you are so supportive of your daughter. Very few of us get that from our parents. Second, yeah shoes are a bit tough. Online is a great place to look.
One tip I have is that open toed shoes are easier. I’ve yet to find a pair of close toed heels that don’t KILL my feet. But my strappy open toed I can wear all day. My two favorite shops are Nordstrom Rack and DSW. Both offer discounted shoes and often have larger sizes, with Nordstrom having the bigger selection. For the good online shops I have to defer to the other ladies here as I’m not much of an online shopper, especially for shoes.
Best of luck. Keep being an amazing Mom!! <3