A couple of people have said childless friends should try to compromise with regard to meeting up if someone has a child. I agree in the early months.
But when DS was 6 months old I left him with DH and had a weekend in London where I met up with some of the women I'd worked with prior to having DS. We went out for the evening, had a meal, did the theatre, late drinks and it was marvellous. They work all day, in London, why would they make the effort to meet me in my local coffee shop 50 miles away during the day just because it suited me? One of them has a husband with dementia, two have kids themselves, one lives 150 miles away. What makes me special so they have to do the running around?
My friends also had to travel into London so all of us were inconvenienced but we did it because we're friends and value each other and we try to meet up somewhere central for lunch as often as we can to keep it going. I have a DH, he's capable of bringing up our child, so it's down to me to make the effort sometimes. Yes it took planning, yes it was mainly a weekend day or overnight on a Friday as DH didn't work on Saturday so could have DS. But they are my friends so we make the effort.
I also meet up with old school friends (I mean from 40 years ago) every year for a 'girls weekend away'. Most of them have grown up children, I started my family late. We have a great time. This year it's a spa weekend. We have a chat about the kids but it doesn't dominate. Lately it's turning to chats about elderly parents and issues like dementia and failing health. We have one weekend to catch up on a year's worth of news so kids often come way down on the list! I love my DS dearly but I recognise that his world is likely to be pretty boring to others after the first hour or so! I know I get bored in the same timescale about other people's kids so why would I push that on my friends?
DS and DH have their dad and son weekend when I'm away. Mainly involves a day out, trip to the cinema, pizza in front of the telly with the football on. They enjoy themselves and I get a bit of 'me' back. Because DS is heading towards his teens and his world doesn't revolve around me any more. I need to move my world forward too. He won't need me soon (though I hope he still wants me around) which is great - that's what I'm teaching him. To be independent so I need to get my dependency on him realigned. Yes he is my world, I love him dearly but he will move on to other, exciting things and I need to too.
I'm emailing an old boss of mine at the moment and we're arranging a weekend lunch meet up - so we're gathering people together we haven't seen in 10 years although most are Facebook friends. I'm really excited to see how everyone is doing. Maybe it'll be a one off, maybe it'll become an annual thing. Who knows? But it's worth the effort.
I think the woman in the blog is going to be in for a shock. Toddler group mums that I became friends with have moved on - their children, in some cases, went to a different primary school to mine. Then the primary school mums I met for coffee after drop off drifted away when DS started secondary school. Because they then had the time to change jobs, take up hobbies, voluntary work or whatever as they didn't have pick up. Many of them live a car journey away from me so meeting for coffee isn't so simple - they haven't got the school drop off in the area to bring them into town. So we meet less frequently.
A few of us still manage to meet up but it's like me and my school friends - we make the effort and we all compromise. Because if you want to keep your friends you all have to compromise at some point.