Mum offended as her friend with no kids won’t travel to see her

What would you do in this situation?

A mum has reached out on Mumsnet after her friend became difficult about meeting up to see her. She said that she agreed to travel up to her and take a day off work, but unfortunately that didn't seem good enough. The user wrote:

"Best friend of 20 years doesn’t have kids. We have been trying to meet up for ages- I have offered 2 possible dates where I was going to travel to her & take a day off work. "he’s pissed off that I can’t stay & that I have to get back to pick the kids up from school. I’d have 5 hours & am travelling to get to get to her. She’s now said she can’t do the dates I have offered & is being difficult. "Aibu to think it’s so fucking hard sometimes trying to explain to people without kids what it’s like to work full time plus raise 2 kids- sort out childcare, manage their clubs & weekend stuff etc. "I feel like taking a days annual leave & offering to travel is making an effort but she’s making it SO hard for me- like I should feel guilty."

There was a lot of back and forth in the comments section, with some saying that the mum doesn't realise that people without kids can be busy too. One said:

"Is it necessarily harder for you though? Before I became a mum I was just as busy as I am now - maybe more because I worked much longer hours and had less flexibility in my role."

While another wrote:

"I don't know why OP is being painted as the bad guy here. "She has offered to TAKE A DAY OFF WORK and DO ALL THE TRAVELLING to get to her friend. That is a NICE THING TO DO. "Her friend is an unappreciative spoilt madam demanding more of OP's time."

What do you think of the situation?