Hi, I can help you with your question today.
We do not see GI signs associated with heat cycles.
Gwen's diarrhea started at that time coincidentally.
Since she is already dewormed on a regular basis, intestinal parasites are less likely (although most dewormers only treat 1-2 parasites. There are no products that can treat for every time of parasite).
Since she is eating and acting normally otherwise, we can try a handful of treatments at home before having her evaluated by her regular vet.
You can use a human OTC probiotic like Culturelle.
Break one capsule over her food once daily.
Since she is flatulent, you can also use an OTC product to help.
In the US we use simethecone, I believe you have a similar medication called activated dimethecone in the UK.
I found at least one product online at Boots called Dentinox infant colic drops.
This medication is not absorbed systemically, and cannot be overdosed.
You can give this as often as needed to help with wind.
You can also use a dose of Imodium for her.
When you return, post back with her weight and I can help you with the appropriate dose.
gwen weighs 29 kg
gwen ways 29kg