Tessa will step back to make sure she's not within melee range of the dwarf, and then speak to the dwarf again.
Let me be perfectly clear here. I can offer you either the carrot or the stick, but this mine is going down. If you try to take another swing at me, you're going to get cut down just as quickly as that giant did.
The mine is going to be shut down, and the only real choice you have is whether or not you die before it does, or if you survive and escape.
There are now three voices talking in my head, but they make no sense at all.
Spoiler: Actions
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Move action, Tessa will move out of melee range of the dwarf.
Standard action: Suggestion (DC 29) You should flee before the mine collapses. You may be able to dig out some loot later.
Swift action: Activate Minor Shapeshift reserve feat to give herself 19 temporary hit points. [Duration 5 rounds]
Using her Suggestion spell-like ability should cause her invisibility spell to break.