Title Company Accountability

[Nick C.]

I have a question for those that might know the answer or have input.

My daughter just sold her house that she's owned for about 5 years.  She bought it from an older lady whose grandson had power of attorney.  While the paper work was being processed for the sale that's in process now, it was noticed that the grandson notarized his own signature on the power of attorney document and it now has to go through probate.  Her real estate agent tried to explain it away, saying it's human error and those things happen.  

My questions are:  Is this really something that happens and you just have to deal with it?  What accountability does the title company have in this in not doing their job and finding this when it originally happened?  Is it worth my daughter's time to pursue legal action? Thanks for any input.