I was given a calla lily for valentine's day... it was potted for indoors. It was fully bloomed when I got it, but once a brought it home the lillies gradually became flimsy and started bending over to touch the ground, I think I've been keeping the soil moist but I'm scared to underwater or overwater it!

I considered the fact that it doesn't get direct sunlight... but I gave it direct sunlight outside for a few days and no change.

Now the leaves are turning yellow and there are no flowers left :(

Not sure what I should do? repot it with new soil?