Intentional miscalling of hand at showdown

[growlers]

Question: At Red Rock there is one female limit player regular who consistantly miscalls her hand at showdown. I have played with her many times, and she does many other angle-shooting things like intentionally checking out of turn, etc so I know for 100% fact it is not just her "trying to be cute". Example: I saw her once intentionally not post her BB even after prompting- push her cards over the line "mucking", then after the dealer told her again it was her BB she "reluctantly" posted and of course had pocket AA. I bring this up only to assert that I think all of this is intentional.

So anyway, she will constantly triumphantly throw her hand down at showdown immediately and announce "flush" or "straight" when she has a busted draw.
So lets assume a board of 9d 10d Qs 6s 8h - she calls down out of SB headsup and river goes check-check - and she truimphantly throws down her 2d3d and says "flush".

Situation 1: opponent turbo mucks and cards are not retrievable
Situation 2: opponent turbo mucks but cards are easily retrievable - but say touching muck slightly
Situation 3: opponent puts cards face down just over the line
Situation 4: opponent beats her to death with his chair but accidentally drops card on floor while doing so
What would floor do in above situations?

Also,
What is the dealers role when she does this? I've never seen any dealer give a warning to her for this. Let's say opponent turbomucks and no one is objecting to her behavior.

[Note I am was not involved in any of the above situations - I know what she is doing and so it not an issue for me personally, but of course it annoys me that someone is blatently angle-shooting.]