This...
Quote:
no, say it was no big deal and walk away.
This...
Quote:
"no biggie" Say nothing else.
She wants attention. Let her work for it.
And this...
Quote:
Maybe she was honestly busy.
And lastly, this...
I was recently(yesterday), in a similar position to you. Girl ignored my calls, (I had phoned twice, - one giving her benefit of doubt that she may have been in the shower or something)
Now, I was a little bugged that this chick wasn't answering my calls, just as you were.
Now I started bugging out over why she wasn't answering - Ignore these thoughts and feelings, they do you no favours.
I also wanted to criticise her for not answering - Don't do this. I know you want to 'set boundaries' or whatnot, but it will only serve to make you look silly and way too over reactive.
Instead, I told her (just as you should), 'No worries' and 'thanks for letting me know!' (the girl got in touch to say why she didn't answer).
I know the girl didn't contact you, but for future situations
Now the first 'no worries', shows that it wasn't a big issue to you. So now instead of looking like you were 'desperately trying to get hold of her', it looks like you were just casually seeing if she was free.
The latter 'thanks for letting me know!' - If you want to 'set boundaries', this is the best way to go about it. Instead of criticising her for doing bad (and therefore likely lowering her opinion of you), you praise her for the good she has done - Which is getting in touch and letting you know why. This means in the future, she is more likely to get in touch or make an effort to let you know.
In your situation you could have said (NON-sarcastically), "Hey, no worries! You shoulda just let me know, woulda saved me the hassle

"
The last line, if you DO say it, has to REALLY sound playfully said. It works 'cause you've still told her to let you know/get in touch. But it's hidden safely in there as a joke. (That's if you want to set up boundaries etc, is the smoothest way of doing so)
Love and Praise
~Finesse