Before I start I have looked and seen similar questions like this, but I don't think the answers truly address the issue I'm having with my group.
I'm having an issue with my group with mostly new players where they are in a very time sensitive situation. Like this:
Character A is walking through a cave and walks under a hidden Green Jelly hanging out on the ceiling of the cave. The Green Jelly drops from the ceiling and lands on Character A's back. Character A must act quickly to strip of their armor, or scrape off the Green Jelly or be consumed by it.
The player of Character A isn't very experienced and doesn't know what to do, but as DM I have to pressure her to do something or simply have her consumed. There isn't time to deliberate with other players, a decision needs to be made now. She begins to feel frustrated and flustered for not knowing what to do, and doesn't want to make an action for fear of taking the wrong action.
In this specific situation a decision was finally made and the character managed to save her life but lost her equipment in the process. Yet at the end of the session she walked away unhappy and frustrated for not being prepared and didn't like feeling pressured to come up with a solution without being able to fully think about it.
I spent a good amount of time talking to her afterwords and tried to explain that situations like this happen in the game, and it's all part of the game, but it didn't seem to help much.
As a DM what are some methods I can use for new players to better help them prepare to make snap decisions like this? What are some DMing techniques I can do to ensure that a player doesn't take too long to make a decision without punishing them for doing so? How much should in-game time be diluted when a new player is being faced with making a snap decision like this (ie: if a decision needs to be make within the next "round" of time in game, is something like 5 real world minutes a fair amount of time, or is that too much/ or too little)?