What does Mary Warren give Elizabeth and what is her reaction to the gift?

Elizabeth says thank you of course, but she's also a bit confused.

From the text:

MARY: (Crossing to Elizabeth, taking a small rag doll from pocket in her undershirt.) I made a gift for you today, Goody Proctor. I had to sit long hours in a chair, and passed the time with sewing.

ELIZABETH: (Perplexed, she looks at the doll.) Why, thank you. It’s a fair poppet.

MARY: (Fervently, with a trembling, decayed voice.) We must all love each other now, Goody Proctor.

ELIZABETH: (Amazed at her strangeness.) --Aye, indeed we must.