Just had out first success!!
Evidently, I was "stuffing around too much" and worrying about hurting her. Lilli just learnt the open command in an hour. Wooo hooo...
We tried it with peanut butter, smackos and her tablet. Five more days of tablets...so hopefully by the end my cheeky little monkey will have learnt a new trick and take her tablets without acting like a drama queen.