They used her a ot in the weeks straight after her return, surprisingly well but it has been very quiet since then, which is now 4 months.
I don't know really, she may well have requested a lighter schedule or perhaps they are concerned that she is going to choose to leave for good (i do think that is a real possibility should Rosie fall pregnant again, 2 yooung children is. Much harder to juggle work around) so don't want to be as 'reliant' on her so are trying to build up other characters so she wouldn't be as missed as much?
As I said, I was pleasantly surprised by her return storyline and that she wasn't being written as a bitter beatch as I thought she was going to be given the pre return interviews and has basically been okay in what we've seen of her so I'm thankful for that. But I would like to see more of her and suspect misery is the only way we'll get it.
Also, I know this is a hobbyhorse of mine and the reason is the actor left and some on here had gone off the relationship anyway but...i still don't really see (and wish they hadn't) split Jac and Jonny up off screen and in such a callous fashion. they haven't (and again I'm thankful for this) thrown nre romantic interests or stories at her (and they must have storylined this 6 months at the time of her return) and haven't needed her to be horrible with the excuse of a dreadful personal life so why couldn't they have had them still be together off screen? They didn't need to be constantly mentioning him (anymore than they have anyway) and could have broken them up at any point with just a couple of lines (one episode a mention that they aren't getting on, the next that they've called it quits but are co-parenting amicably) if they did actually need her single for some reason. And i still say that any potential new relationship (or a Joseph return) would actually be more dramatically interesting if she did have a significant other that we the audience knew, even if they were no longer featured, as it would mean conflict re her feeling guilty.
Finally, if Rosie does fall pregnant again and they need to write her out relatively quickly, they have a ready made reason - Jac and Jonny have, without it being mentioned and why should it be as there is nobody she'd confide it on the Ward, been trying for a second baby all this time, she's now having one so actually taking maternity leave at the usual time. Easy.
Sorry, my little rant again but it does still bug me how they handled the breakup and i really fail to see why they needed to do it given how her storylines have panned out in the last 6 months.