Gosh Starry, I'd forget about her, she sounds like a real mememe sort of person! You poor thing.
Re. the homesickness thing - it sucks, doesn't it? I'm here (north of Sydney in semi-rural NSW) for the duration because DH is Aussie and really doesn't want to ever go back to the UK to live. I've just (literally, yesterday!) returned from our annual trip back to the UK to see family and friends and, while it was lovely, it hurts so much to come back. I take our DSs with me but DH refuses to come because he doesn't like to fly that much, and he doesn't like staying at my Dad's house (and he's no need to see my family and friends). It works ok, actually, because I can then take the boys wherever I like, without worrying about his sensibilities - the flights can be a bastard (especially this year!) but aside of that it's ok.
But still. England in spring - delightful! We were very lucky to have had really good weather (t-shirts, no less!) and it was beautiful. Back here, it's cooled right down which is lovely but makes the house so damn cold - haven't rewired the heater yet, and the coal fire is going to be fucking difficult challenging this year with an 18mo toddler!
But I do have friends here, which helps. ANd yes, I did find them all through having DS1 - he was a toddler when we moved out nearly 5y ago, and I took him to 2 separate playgroups to maximise the number of people I could meet. It worked pretty well - and some of the children DS1 met are now at school with him, so it's been fine at the school as well. I've also now joined the P&C (Aussie equivalent of PTA) and that's increased my social circle; plus talking to parents at DS1's activities.
DH was no use whatsoever on the social front - he has 2 old friends, one of whom we've seen 3x in nearly 5y, and has never visited us; and the other of whom we've seen 4x and he has visited here all of those, once with his family, but we've never been invited to his place. Hopeless!
So if it hadn't been for my efforts, I'd still probably know no one out here. Yes, they're "parent friends" but we have other stuff in common as well - I'm not friends with all the parents I've met! I suppose the one common thread among them though is that they all have some link with the UK - one is married to an Englishman out here, another is first gen Aussie with English parents/family, another emigrated out here aged 8 from England and so on.
We do have DH's mother around, which is nice for the boys - and she is helpful for babysitting and so on. She is a nice woman and we get on ok but I sometimes feel that DH is more in partnership with her than me - she's far more compliant and does whatever he asks her, whereas I am more "difficult" apparently.
In your situation, if you're both missing home/the UK so much, would it be so bad to go back? If you do have children, it doesn't make it easier - it makes it harder to realise that family are missing out on seeing them grow; and the children miss out on memories with their extended family. I know that's not exactly helpful but it is realistic. I keep my boys in touch with my Dad and sister and her DDs as much as possible using Skype etc., and they always seem to get on well whenever we go back, but it's still hard to know how much we and they miss out on. None of my family will ever be able to fly out to visit us - health/wealth issues prevent them, so it's up to me to take the boys back every year (I have to - if I missed a year and Dad died in between, I'd be so guilty as well as heartbroken).
Sorry, massive epic post but I hope there's something useful in there for you.