Ask:
I tried signing up for another member name but I couldn't...what's the best way to go about this so I can be sure she's received the things I've sent?
Answer:
They should let you know by posting a thank you or something!
Answer:
I reminded my group (in which you and your Big Sis and L'il Sis are apart of) to take the time to thank their Big Sisters when they receive a gift. I think that is just common courtesy. Another way to find out is to simply PM the person (using the Secret Sister sign in) and say "be expecting something in the mail. Please post a note in SS to let me know when it arrives".
OR if you are mailing something, ask for receipt confirmation!
Answer:
Is there a secret sister login we can use?
Answer:
Yes. I'll pm you!