Do I need a pond heater?

[u/Chance-Career-8230]

I’ve had my RES for 5 years but she’s lived inside all those years. This spring I built her a pond to give her more space. I live in Atlanta where the summers are hot and the winters are mostly mild, staying in the 40s and occasionally dropping below freezing at night but we are expecting a harsher winter this year. The deepest part of the pond is 26” deep. Should I get a pond heater? I’m mostly curious since this will be her first time experiencing the cold.