What’s Up With My Wilting Peace Lily?

Ask the Expert: Help! My peace lily’s leaves are wilting!! I’ve had a peace lily for about a month.  It was growing beautifully and sprouting a white flower.  Last week I noticed that all the leaves were slumped over and sagging, no longer straight up and stretched.  What can I do?  Should I put a stick in the soil and hold up the leaves. Repot the plant?  Please help! Trina