Also, see what the fine per day is for not having the handicap bathroom - might be worth it to pay the fine until she finds a way to do the work to the bathroom or another way to remedy the situation.
At least she can increase her business back while she figures this out
There is not a fine per day. There is no C/O until building, life safety, energy, health, and accessibility codes are met. If she is able to make the needed alterations and gets a C/O then if someone alleges a violation of ADA it is reported to the DOJ. Then they start the process of responding to the complaint. Depending on their findings that’s when the fines start.
Oh and potential violations include many things that the building inspector never deals with like braille menus and knowing the law about service animals.