N E 1 know anything about Calla Lillies???

My Mum has bought an indoor Calla Lily and 2 of the flower have died. there are plenty more flowers and the plant is no way dying, i think. Do we cut the dead flowers away or leave them? somebody please help???

 

Normaly speaking the Calla Lily is a repeat flowering perennial and can go outside in the summer. Have seen them outside many times - no problems in cutting the dead flowers off.