Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice.
The 
back pain, considering her history might be related to 
pancreatitis and also to 
stomach ulcer.
Even if she had the ulcers removed many years ago, she still has the risk of having another stomach ulcer.
She also has had pancreatitis in the past , this makes her having a higher risk of having another episode of pancreatitis.
After 
gallbladder surgery, there is a possibility of remaining a 
gallstone, in some cases, and this also has a high risk for pancreatitis.
I highly recommend you to go to the ER, consult a gastrohepatologist , for a physical examination, performing a stomach endoscopy, or an abdominal CT scan for the right diagnosis.
Hope I have answered your query. 
Let me know if I can assist you further.