Dionne, these little ones of ours, are so sharp. They can feel very threatened and resentful. They're honest about their feelings - not like us that can be a bit more diplomatic. They also tend to "wind" us up when we're needing to do something, etc - but they don't intent to do anything delibrately - it's their way of feeling left out and that's how they deal with it.
I think it might be worth a try to make up a playbox for Dior to take out only when you're bf'ing. Occassionally add something new that she can discover. Give her loads of praise for being such a clever girl and great, helpful sister.
You're doing really well. Harley will get the hang of it, but like said before, it'll take a bit of time and effort. Once you crack it, you'll love bf'ing! Enjoy doing it too and don't stress.
I hope you have a great day today - I really admire you !!
Emilia xx