Hand from Super Thursday final table

[freemont]

This was one of those hands where I had to go into the deep tank and though I think I was right in how I played it, but I'm curious what other MTT players think is the right line?

Here's the background. Sorry for no easy hand converter stuff and the approximations on the chip counts, but I don't have the info right in front of me on my work computer.

Players: 6
Blinds: 5K-10K
Total Chips in play 705,000
Button~ 117,000
BB~ 48,000 after posting
SB~ Me 180,000 after posting (I was the big stack at the table.)

The button had previously been pretty active in her steal attempts from the CO and button. Three times I had come over the top and she had mucked, the last time being on the previous hand where she tried to steal from the SB and I pushed with AT from the BB she mucked. I think she was fairly frustrated by me coming over the top all the time and wanted to take that play away this time. So when folded to her she open pushed all-in. I'm in the SB with 99, what's my action???