Is this a mouse problem?
You can change the settings on your mouse by going to start/settings/control panel/mouse
Check out the different tabs until you find one that says something like change settings/switch buttons or switch primary and secondary buttons. This would put the control of her fore finger on the proper button for a left handed person.
They also make a left handed mouse. She may want to check that out.
It would be extremly rare for a program to have options for left handed or right handed users. Although she could check out her help for her ARC program and see if it has that option. If that option isn't available...and I doubt it is...then nobody can change this for left handers in the program itself....accept for the creaters of the program.
Hope this helps.
Niki
