Interesting development.
To get the orders clarified, you should e-mail a copy of the orders to the judge's associate and ask for clarification. Make sure you CC both the mother's lawyer and the ICL into the e-mail. Interim orders can be a bit iffy in their formality, but my view is that we're dealing with an over-worked and under-resourced institution here, so their capacity to give rightful attention to detail is limited. I proofread for a living and even I have been known to miss the odd spelling error.
I think it's important that you keep a timeline of mum's interference with grandma's employment. There are many judges in this state who would view such behaviour as intimidating. My husband's ex-wife wrote in a text message that I lied in one of my affidavits and that it could mean I lose my job, but when that was put before the Magistrate, I believe the exact phrase she used was 'I find that emotionally and psychologically abusive'.
Re: phone calls...look, you kind of a little bit want mum to contravene over this grandma stuff. It sucks for the kid, but it helps your case a lot, so just let her carry on whenever she sees fit, and quietly jot it down on your running sheet of missed care and communication events. The Court really, reeeeally doesn't like it when parents flout their obligations under the orders, so, you know, let the chips fall where they will.