I tried GIYF rule, but google doesn't like this question.

My Ball python girl is about 20 years old now. I'm a tad worried about her because she hasn't eaten in quite a while. I put in a rat and she initially shows interest (stalking it, flicking her tongue at it), but then runs away from it. I try to offer her every week around the same time and she's always been a solid eater. Sometimes when she was younger she'd eat 2-3 rats in one sitting with gusto (I sometimes barely had time to put it in before she struck--all her children and grandchildren have been like that too). (I'd give her a rest, of course, and let her pace herself.). She's only gone off eating once before off season unexpectedly when her nose got injured, but once it healed, she was going at it again with the same gusto as before.

But these days, she's not eating as frequently, or as much. It's been a few months since she's eaten and the other ball pythons are eating fine. She's more interested in her old habit of pretending she's a boa and sitting in my lap and socializing than eating rats. (I know because every time I open the cage she tries to get out... and yes, she has plenty of hides, and is fine during the day--she's always been this way--I open the cage and she wants out and doesn't want to go back. She sometimes likes to greet me when I'm near.) But The ol' 5 ft girl is losing weight too much. She used to be nice and plump (over 2500g), like she's supposed to be, but she's growing thinner.

I checked her for signs of infection, etc, but she's perfectly fine otherwise. I've tried to change her bedding, just in case, too, she's being fussy about her surroundings. (She likes to tip over her water bowl when it's empty and stare at me... weirdo--she really is an odd ball python--lots of quirky behavior since I got her when she was small.).

I can't find anything on how to care for an older ball python--like how frequently to offer food, etc only for new babies. Anyone have tips? Anything I should watch for in older snakes. Not sure why she won't eat.