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At the time, Tigerstar was influencing her judgement.

I agree with above and i dont think she wanted him to die but i dont think she had a choice... if she tried and stopped him from dying she basically be "betraying" Tigerclan and Tigerstar woud be mad. - Hawkbreath

Also, she was in love with Tigerstar, and if she didn't do what he wanted she would probably be kicked out of TigerClan.