Gave 2 shifts to my coworker, coworker finds 1/2 shift too busy and doesn’t wanna work the second shift, now she wants to ‘give back my shift’

I gave her 2 Sunday shifts (Feb 24 and March 1). She worked yesterday (Feb 24) and this how the conversation happened

Coworker: “today (Sunday) was so busy! I don’t wanna work next Sunday anymore (March 1).”

Me: “oh that sucks. Tell the manager to see if she can schedule more people.”

Coworker: “can you ask -another coworker- to work next Sunday.”

Me: “well I gave you my shift so it’s your shift now. You ask.”

Coworker: “well I’m giving it back.”

Me: “I decline.”

I’m not in the wrong here right? I told the manager already (3 weeks prior to the first shift) and I gave away my shift so it’s no longer mine but the coworker who I gave it too.

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