Such clumsy character assassination. Alpha lured Carol into that cave like she was some dumb walker. Alpha even flashed that dastardly look making the whole sequence as annoying as a twisted ankle ploy. After everyone initially survives acting like lemmings, Daryl gives Carol a talking to and Carol reveals her hatred towards Alpha about Henry. Well big whoop. Perfectly legitimate emotion and I don't see any reason why Carol couldn't have shared any of that with Ezekiel or Daryl. They did the same with Siddiq. Instead of telling Rosita he was having episodes and just watch his back, he choose to stumble around in his angst and put everyone at risk.
Then after having a heart to heart with Daryl she pulls that stunt. She didn't tell anybody but what was the point of having her climb so precariously to ignite a short fuse? There was no indication she was going on a suicide mission, so why did they suddenly write Carol Betty Boop stupid with a plan to light that short fuse, skedaddle back down the cavern side, meet up with the others still in the process of finding an escape route and say "hey guess what!"
The wailing "just say it" at the end was stupid because they just had this conversation.