Leah seems to forget she is on a show and we can clearly see what she is doing. While editing can be wonky, they didn't add the soda bottle after the fact or take a pic of her texting and make it look like she was in a car. I also don't think we have ever seen her not texting while driving, she does it every time.
Jenelle is pretty much a waste of space and it's clear there is no bond with either of her children. If there were she would have wanted to cuddle Kaiser, not escape to the front porch. I get being overly tired because a kid is sick, but she isn't nurturing even when everything is fine.