ye gods ! terminate immediately
she is not taking care of your DDs basic needs if she is feeding her food that will make her skin worse
and as for not being there as her DH wants a lift to work !
she is entiteld to holidays etc.. but to give you reasonable notice ,so that you are not left in the lurch
as for e coli! she had better get onto environemntal health !!
she sounds like a skiver who is not taking her responsibilities as a child care provider seriously enough