Step 1: Buy tickets to ride the "SEJLBAHN" (Cable Car) that travels across the Rhine River in Köln (Cologne), Germany.
Step 2: Convince your mom that THIS IS GOING TO BE COOL even though she does have a small fear of heights AKA "fear of falling into the river"!
Step 3: Keep smiling at her, trying to make her feel more relaxed!
Step 4: OOOOOOO and AAAAAAAH about how fabulous everything looks from this view above the Rhine!
Step 5: Scream out, "OH MY GOD, THOSE PEOPLE ARE NAKED DOWN THERE!"
Step 6: Enjoy the rest of the ride because I assure you that she will not think about HEIGHTS again!
See!! FEAR OF HEIGHTS SOLVED!