Provide the theme summaries for the following conversation: 

Delia: Hey Sandra, thanks for looking after Zoe for me - I know she had a great time today with Amy. She's still gushing on about the aquarium.
Sandra: It was my pleasure - Zoe's a real angel and I know for a fact that she and Amy or plotting to become legal sisters in some way.
Delia: It's lovely that the two of them are so close. However, I wanted to ask - did Zoe leave her red sweater at your house? 
Sandra: I can check, but so far nothing's turned up. I'll keep you posted though.
Delia: Thanks Sandra, that would be great.
Sandra: Delia - Ted's just told me that he found the sweater and has already packed it in Amy's bag, so she'll give it back to Zoe at school tomorrow. 
Delia: Thanks Sandra!! Take care. 

Summary: 
Sandra went to the aquarium with Amy and Zoe, Delia's daughter. Amy and Zoe are close friends. Ted found Zoe's sweater. Amy will give it back tomorrow.