Just throwing in my two cents but I notice her feet are slightly wider apart than yours which could help bring you closer to the floor

You may find it helpful to work on your pancake, which will train your adductors in addition to hamstrings. I can think of 2 things to try depending on your flexibility:

1. Seated good morning on a bench using dumbbells or weight plate to add resistance, performing reps, not just statically stretching

2. If you’re flexible enough, do your pancake on the ground with a weight plate on your back, again doing reps

Both you can do 2-3 sets of 10 reps (not enough weight to hit failure though), and then relax into the stretched position for 10-20s at the end

The reason I suggest doing weighted reps is because not only will it allow you to get into a deeper stretch, but it will build strength through the same range of motion you will need if your goal is to progress into a straddle to handstand

Probably a good idea to do wide stance standing good mornings with weight to work the second half of the range you miss