Mrs Murphy films her videos with her phone in a holder designed for the car, which she then speeds up and adds a voiceover to before publishing.
Speaking to BBC Radio WM, Mrs Murphy explained how she dealt with negative comments and being online.
"I'm just a normal person, having that many followers doesn't make you anything special," she said.
"You have to have thick skin. Because of my age, I feel like maybe I can cope a bit easier.
"There comes a point where you do just need to switch your phone off but I am so privileged to have this as my job."
When asked how to achieve TikTok fame, Mrs Murphy said her biggest piece of advice was to post consistently.
"Post the video, I know it sounds ridiculous but don't worry about the editing and making it perfect," she said.
"People don't like perfection because that's not real life."
