I have a female rainforest mantis that recently molted into adult-hood.
She refuses to eat which is approaching day three. I fed her mango which she loves and usually always will nibble and consume a small strand.
Hope she decides to have a full meal soon.
I am new to having a pet mantis, but If I had to leave for an extended period of time I would leave my mantis with a pet store and hire someone there to properly look after her.
A small pet store would do the deed. I leave my dog with her trainer for boarding, care, and training.