Allison will not go in gear

A little more info received. She has been at the rally about 6 days. Part she disconnected was fuel sending solenoid (repeating what she told me). It would start, but not stay running, that's the reason for disconnecting. At this time she has tried moving it with that part connected and disconnected. Then she said that she thought it was low on motor oil, perhaps as much as 4 quarts. She just came back from Florida where she had a heart attack 6 weeks ago. Probably just not paying lose enough attention to maintenance issues due to health. I advised her about the brakes. Sorry I am not more mechanically inclined. I probably was not the best person to call upon for help. Thanks for the responses. She is getting motor oil in the nearest town and will see if that solves the problem. Her next step will be the brakes as you suggested and then a mechanic.