She's getting about the same times my 2012 Mustang 5.0 should be doing. She's either a lousy driver or has a bad car.
On a 0-60 run the 2016 and newer SS, LT1 would pounce this. Shes doing 4.5 to 4.7 in most of those runs. Most of the SSs I see on youtube are 4.0 to 4.2 but I've seen other Challenger and Charger Hellcat owners on Youtube also only doing mid 4s to 5 second 0-60.
I know wheel spin is a big factor with the Hellcat but is the weight really hampering these things?
Personally I'd take a ZL1 or C8 Vette over a Hellcat.
Does a STOCK Challenger Hellcat really do 0-60 in 2.9 seconds? | Female Owned - YouTube