Islamically there is techically. It's good that you were modest in the way that you complimented her, I totally get you, but fundamentally according to how the first generation of Muslims (including the Prophet SAW) and also the following few generations (which collectively are the best generations of Muslims to walk this Earth) interacted with women, not even this kind of modest complimenting is really permitted, as far as I am aware
If you wish I could find quotes or fatwas? The time of year (Ramadhan) matters only in that good deeds are heavier in weight and also bad deeds are heavier in weight, and thus her mentioning Ramadhan is meant to refer to this fact, and she perceived complimenting her (even modestly) to still be negative. Because of Ramadhan, people often expect themselves and others to be on their best behaviours and limit even the smallest sins if possible.
I understand by your reaction to this that it might be a shock or you might think only really strict and conservative or extreme Muslims believe in what I said, but the reality is that the Islamically correct position is to limit contact with non-Mahrem females.
Many of us struggle with implementing these rules, but InshaAllah we can just try to get progressively better. May Allah guide us all, Ameen.