I do vaguely remember that with Joseph - actually from what I recall (which may not be strictly accurate) she seemed more relaxed in general back then.
I do hope if it is the nurse thing (which I'm thinking it probably partly is, although not I think the main thing) she is able to get over it if/when they ever get back together again.
Also, that Jonny is able to get over his, for me, really annoying habit of, when push comes to shove, nearly always thinking the worst of her until she proves him wrong (like with the Imelda/Hanssen thing when he didn't give her a chance to explain about her involvement properly and their conversation before she left for Sweden to bring back Hanssen). I know he can be VERY supportive of her and has proved this many times but still think, when the chips are down and he has to make a choice about her intentions/motivations too often he assumes she's doing things for the wrong reason, rather than giving her the benefit of the doubt (although think this had changed slightly before their whole break-up)