dudleya gone bad

Ι am not happy with my dudleya. Which was supposed to be the pearl of my collection, the only California native I have. It seems two hours of afternoon sun don't do any good :/
This is her, now (Yes, it's a girl):

 

 

And this is her glorious self last year, when I bought her:

 

 

It seems the bottom leaves are rotting, and generally, the leaves are getting thinner..