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Hello, My name is Terri.It is my pleasure to assist you today!I am reviewing your question right now and will reply in a few minutes.
Bless you for wanting to help funny Face.
Ask the local animal control or any rescue to loan you a Have a Heart trap.
Since she is used to you providing food, if you place it all the way in the back of the trap (and she is not to mobile due to her injury)
It is very likely she WILL go in.
Left alone the injury will not heal properly leaving her at risk for infection and further harm.
Please let me know what happens.