Konamisan ~~ other things, like vaccine reactions, can cause these same skin issues that allergies can cause. Has your JRT been vaccinated recently? Also sounds like there might be an internal yeast overgrowth (which can also manifest in symptoms like you are seeing). Does your pup have a “corn chip” or yeasty smell?
Also it is very common to have “set backs” or detoxes when the immune system is compromised and the body is allowed (due to a change to a better food etc) to rid itself of nasties.
How long has she been on the probiotics. Probiotics are very important but can cause a mass die off of systemic candida and that die off causes toxins (released by the yeast as they die). That die off can cause the symptoms you are seeing.
It very well could be a reaction to another food but I think some of these other possible reasons may be worth considering..
