First, Erica, let me give you a hardy
!! And Happy
4th to you.
Now regarding your plants and pics: I notice that one of your succulents has been planted in a bed that is covered with rocks that has black plastic underneath. I am wondering how much air flow and heat retention is affected by all the rock and black plastic, not to mention the daily 110 degree which would add to the problem. I would imagine that the soil underneath is not so optimal for water movement, water drainage, exchange of hot and cold, etc. Your plant roots may be overheated and/or waterlogged?
Your Baby Sunrose is Aptenia cordifolia