People aren't always explicit, Macaroni46.
It's possible that when she texted that she was on holiday, she assumed you would understand a subtext of, 'I'm not really available right now. Unless it's life or death.'
That isn't people being difficult, it's a different communication style.
There's a thread on here, right now, with a poster taking offence at her friend's text style - it's clearly a minefield.
It's just not worth reading too much into it.
If you still feel the same way in a fortnight, dial the friendship down to a level you're comfortable with.
Honestly, if your friendship is of long duration, it's probably not worth making this an ultimatum issue!
Anyway, the sun is shining. Maybe it's worth choosing to do something lovely fit yourself to lift your mood. No point dwelling on things that get you down.
And, generally, phone calls are far better than WhatsApp for emotional closeness and elimination of those uncertain pools of ambiguity.