As far as I remember on Parabuthus species is that they are not really prone to mycosis, so having it had a bit to the moist side is not that bad if there are no dark spots on it now.
It sure doesnt have lasting effects otherwise than that. So I wouldnt worry about that, keep her at 50% relative humidity now.
Since you live in Africa, where the animals naturally are, I guess your temperature ranges should be ok?! Around 30 degrees Celsius at day, have a nasty temp drop at night.
Make sure they can burrow! Can make them behave strange if they can't. They are nasty burrowers if memory serves me right. A happy scorpion is a scorpion you almost cannot see! Get at least 4 inch of substrate.
Also, if you fed her too much and she is like a golfball on legs then she goes in 'eating sleep' mode. Lethargic. Getting more active again, when more food stored in her body is eaten. Only you know what she ate before. I dont feed my scorpions past the point where their tergites and sternites get too far apart and too much intersegmental membrane can be seen. As far as I know they cannot die from too much food, but it sure makes them 'slow'.
As you already said yourself, during winter they can become less active too, obviously.
I dont believe their digestive channel can and will ever get blocked, maybe of eating too much sand but then some, I never heard of it.
As said already, post a picture to see if she is fat or not.. if she looks healthy dont stress her out too much by poking her or whatever.
She will likely act normal after winter and/or digesting her food completely. Up the temperature a bit if you are really worried and want to see some improvement soon (she will likely eat more if you are worried about that).
Crawling next to the heat mat suggests she likes it hotter. Being winter, if I were you, I would just let nature go through the normal temperature drop together with her, making her feel all ready for the summer when it arrives!
Hope she goes into normal mode soon. THat being said, I only have andros.. so they might be slightly different! I keep mine almost bonedry with only a bottlecap always filled with water. This evaporates, but doenst cause a 10+% added humidity. Only barely noticeable.