Ashley may be OP, but yes, you would need to stop her from spawning minions. I think you could have easily won against Ashley Panther alone. Though even within one turn she can spawn a lynx and transform and attack with both. Given action surge she would get three hits and a potential for 4 with grapple.
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> And it might have been better to actually read about the enemies capabilities. How far can Ashley Panther charge and attack withc Action Surge?
50ft, so 100ft dash and then another 50 with pounce, the lynx can go 40.
Action surge is once per long rest I think though so it's a good open or finisher.
I think you shouldn't feel bad, this is why training is good.