She is not adult, could she still be calling for a male ? Tried to feed her again and she doesnt want it... Hard to take pictures because it's a bit weird, the spots are at each section, and i can only see them when her abdomen isnt bending over her... the black spots are centered and at each section. Maybe this helps... If it's an illness, how did she got it and what can i do
If she is not an adult, she is not sexual matured and would not be calling a male. Just taking
a guess based on the abdomen movements, refusing food, and black spots, she could be constipated which is life threatening.
If she is the only trick I've heard of to help is to keep the humidity higher in her habitat than normal, and also getting a small bowl (or even a jar lid) with room temperature water in it and try to see if you can coax her into leaving the tip of her abdomen in it for as long as possible. The humidity may help dissolve any if it is impacted around her anus, the bowl of water will dissolve it for sure though if that is the problem (but it can be hard to get a mantis to soak the tip of their abdomen in, you may have luck placing her in a smaller height container and placing the water below her, moving it higher until it touches her, then leave it at that position). This is a trick I read in a scientific paper about a constipated walking stick.
Without photos though it is impossible to tell what the black spots are (and likely the problem). Well if photos are out of the question get a video (30 seconds or longer) of her preferably moving around a bit and that would likely be better than a photo anyway. Just upload it to youtube and provide a link - or if you don't know how to do that then private message me and I can give you my e-mail address so you can just attach it and send it to me in a email message. I'll then post it online for others to see as well.
In the meantime get some 100% pure honey (not the fake stuff sold at most places), and put it on a toothpick and give it to her. Likely if you have never given her honey you will need to rub it lightly on her arms or mouth, which she will then clean off and want more. It will help keep her strength up from not eating, but is not a substitute for feeders.
The only other black spots I have heard of/seen are dried blood from a injury (which are healing if it is dried), or a bacterial infection. If it is bacteria sadly there is little if any that can be done - they say giving a mantis honey can help fight the infection, not really sure but it's worth a shot.