Lawsuit for specific performance

[Michael B.]

Currently working through a nightmare portfolio deal with a 76 year old lady. Closing is supposed to be on Friday 8/30. Now, towards the end of the transaction she is suddenly demanding more money at closing - which she said we verbally agreed on. Obviously there was no verbal agreement and I found out that the lady has a medical procedure done on Wednesday and probably wants to stiff arm me out of additional funds. In fact, she just signed another addendum last week (for the terms) but there was no mention of additional funds at closing when I drafted that up and had her sign. I told her yesterday that I will sue for performance if she doesn't show up to closing on Friday. 

Has anybody here ever done a lawsuit for specific performance? How much did it cost you and how long did it take to enforce the contracts. Did you have to show up to testify in person - I don't necessarily want to show up in person. I'd rather do deals lol. 

Thanks a lot for your help everyone!