I have a friend who will traveling to France we Are on Business Class She Is Travelling Economy Can We Buy Her A One Day Pass On Star Alliance / Thank You This Would Be For April

You invite her as your guest

Worst case $65 USD for a pass

Based on the star alliance lounge access policy (https://www.staralliance.com/en/lounge-access-policy) it seems that business class passengers are not allowed to bring guests, unless they are star alliance gold members. you can get her a one day pass from United Club or Air Canada Maple Leaf Club so that she can join you in the star alliance lounge.

yes just invite as guest

You can invite one guest.