If your phone account allows it and she has provided you a phone number, phone her.

Otherwise, it doesn't sound like worth the effort for very sudden meanness after several yrs. of no contact.

Sometimes the past is best left...as the past. And that includes friends with whom you've lost touch for several years. (presumably if both of you still close and good pals, you would still be in touch regardless of whether Facebook technology even existed. Or even the Internet for that matter.)