Being an asshole is a mental problem in the literal sense. If you mean the thing more commonly known as a "mental problem", then no, we can't because we don't have access to her diagnosis.
You know why "retard" is offensive nowadays, even though it literally means "slow" which is a pretty nice word to use? Because people overused it to mean whatever they wanted and, unsurprisingly, people stopped liking it. Don't do the same for "mental problems".