Special Needs Smelly poop

[Little Angel]

My senior female is about 6. She's a rescue and I don't know when she was last at a vet. I have had her for about 7 months. When I got her she didn't smell.
I have noticed in the last week her.poop has been really smelly. I clean her poop out twice a day and change her bedding constantly so my place doesn't smell.
I also have two males that are about 2. They all eat the same food. The males don't smell. I sanitize the female's cage twice a week and it still smells. Please someone help me

 

[Guinea Pig Papa]

She may have something wrong in her gut. My first inclination would be to cut out veggies, and begin giving her Benebac once or twice a day to see if that clears it up.

That said, what is her diet like? What do you feed her?

 

[Little Angel]

She may have something wrong in her gut. My first inclination would be to cut out veggies, and begin giving her Benebac once or twice a day to see if that clears it up.

That said, what is her diet like? What do you feed her?

She gets fresh hay and pellets and water. I give her veggies once a week.

 

[Guinea Pig Papa]

While limiting veggies is ok, each pig should get about 1/8th of a bell pepper a day, for vitamin c content.

I would start with the benebac, and try that for a few days before making a vet appointment. She may have a parasite or less likely, an infection. Keep an eye on her.