(fl) Worker's Comp Lawyer Requires Waiving Of Statutory Right That Limits How Much They Can Charge, Is That Normal?

Mother was injured in a factory incident and has retained a large firm who I won't name. I'm a bit concerned - first, they had her docusign the contracts while on the phone with them and waiting, so of course she didn't read them because they were waiting on her (yes, I've lectured her). Second, one of the things she signed was a waiver that allows them to charge above the amount limited in statute. They want to charge her 40% of the settlement. Statute limits it to 20% of the first 5k, and then lesser pecentages of amounts over that. Under half what they're quoting. Also, there is a forced arbitration clause and it sounds like if they lose, she's on the hook for the opposing counsel's fees.
I'm sketched out. The contract does say she has 3 days to cancel. She signed on the 18th, so she has until tomorrow. I guess the question is - is this normal? Would we expect such a waiver from any attorney we go with? Or is this the huge red flag I think it is?
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