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Are you using Yahoo messenger on a computer or on a mobile device ?
She also using Smasung phone ?
Okay, please send her some messages from Yahoo messenger on a computer. Check weather she can receive the message or not. If she can't receive the messages even if you are sending it from the computer, the problem is with her side. Something blocking her incoming messages.
Check that and let me know the result. Ask her and collect the details about how she is connecting to internet and using Yahoo messenger.
Okay, take your own time