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As long as you Refrigerate it. It should be fine.
Monita is a Recipe Tester for Food52
Would reheat over a double boil with gently simmering water
Sam is a trusted home cook.
THE NEXT DAY?
Just get eat it, it's fine.
Now, you might get some seppration depending on what recipe you used and how your cream is in there.
Margie is a trusted home cook immersed in German foodways.
Leftover creamed spinach is even better the next day. I make more than I will eat so I CAN have leftovers. And I just heat it gently in a small pan--no big production.