The claim is not unfalsifiable - on set of morality amongst all the sets could be right, and mixing empiricism into it does not make her case better. I was thinking the same way as a teenager, until one night I violently woke up with the realisation that the Christians, or the Muslims or the Scientologists could be right and the rest wrong...

Being a sceptic is a rather tragic endeavour.

It is said that only religious people can argue logically for their moral on the other hand, because logic needs a foundation like math needs numbers - but that obviously does not mean that you can not have a moral even though you are not a believer - you can, for example, base it on a whim or whatever.

I also think that it is possible to live without feeling a meaning with life. Dogs and cockroaches do a good job in that... so why not nihilists.