Mab could apologize. Sometimes. If diplomacy was necessary.

"These are very human reasons, aren't they?" She asked. "Once you are dead does it really matter if you have left something behind? Your place will be filled and nature will move on." It is probably something they will have to agree to disagree on. Death is final to Mab, those with souls might move on to their respective nirvana but for the fae you simply become part magic again. True she would not approve of someone just laying down and dying but that was more about drive than anything else for her.