Glitch or hallucination?

I was about to go for a walk and speaking to my mom, I see her with the arm towards me, holding a 20 euro bill.Banknotes are colored here, it was blue.Mind you I watched it closely, not with the corner of the eye.I turn my eyes for a split second, then turn around, she is holding a 5 euro greenish bill now.Doubt she switched it and gaslit me afterwards, as I wa REFUSING it and even her gaslighting me would never do this and THIS QUICKLY.It must have been a glitch or an hallucination due to heat.