I am confused between the spelling and meaning of the names for my daughter. Is there a difference in Enaya or Inaya? and which one means Gift from Allah?

There is no difference between Enaya and Inaya, they are both one and the same name. The meaning of this name is "Allah's help and support", not gift. But since Allah can give you things as gifts to help and support you, you can think of the name's meaning as gift if youlike.