Do you have to have permission from lender to add a name to a deed creating a joint tenancy? (Floroida)?

My friend was talked into adding her boyfriend to her deed and creating a joint tenancy. He makes no payments and has no equity in the property. There is a mortgage on the property and permission was not obtained from the lender before this was done. What can she do to get this reversed or is it even a legal deed in the first place since the lender is unaware of it and did not grant permission to do it.