I have a mare that I started adding speed faster than a slower cruise through in Feb. She used to be pretty much automatic where you'd just drop your hand and she'd turn in indoors or outdoors. Now she is shouldering in indoors. I havent changed anything and I cant figure out why. Doesnt shoulder at all in outdoor pens.  Even if I take her in an exhibition and over exaggerate picking her shoulder up/going a step past in the indoor then she over exaggerates in her run and it's a mess. Shes perfect in slow work at home and runs at home because of course it's outside. Suggestions?