HIDA Scan 10% Ejection Fraction

[callol]

Starting at the age of four my daughter started having episodes where she would get very pale, start vomiting, and then fall asleep.  She would then alternately sleep and vomit for 2-4 hours.  Once the episode passed she would wake up, be very hungry, and back to her normal energetic happy healthy self.  She has no fever during these episodes and they occur anywher from once a month to twice a week.  At 5 she had two hida scans with ejection fractions of 17% and 23%.  We also checked for reflux, hernia's, etc using various tests which ruled out these problems.  She is now 7 and just had a CT scan and another hida scan.  The CT scan was normal, but now her ejection fraction is 10%.  Surgery has been recommended to us to remove her gall bladder, but we've also been told there is a chance it may not alleviate her symptoms.  I guess my question is given three low ejection fractions and having ruled out so many other problems should we go ahead with the surgery?