If your mother is not an actively licensed real estate agent, then no, she cannot get a commission. They do require agents to provide their state license number, which is verified.
In FL it is a crime to collect a commission on a real estate sale if you are not appropriately licensed.
Since the money is collected either way, why not hire your own buyer's agent, one that is well versed in dealing with Hubzu. Hubzu is not the easiest company to deal with as an experienced agent. As an inexperienced buyer, it makes sense to have representation.