Answer
Both are traveling at a different rate and are opposite to one another. Marlene has touched the shiny logo on Shelly's jacket. She is observing in her own reference frame that is why she is correct. Shelly, on the other hand, is observing on her own reference frame. Thus, Marlene may be approaching Shelly, from Shelly's perspective, at a high rate of speed, and even if she merely touched her, Shelly felt as though Marlene poked her incredibly hard.
Work Step by Step
Both are correct, as they each have their own frame of reference and consequently different perspectives on what happened.
