Instead of hitting the "it's only your turn" button.

I'm in a fairly new LTR, 7 months, not living together. Yesterday, for the first time, she was deliberately a pain in the ass. Things went a bit like this.

First, on a talk on the phone, she was pissed as fuck with traffic and accusing all people in my state to suck at driving. At first I gave ears, then I mocked her, at last I pushed a change of subjects. The last bit went well.

At night over the phone we talked for some time, and she said "we're not on the same page today". We talked a bit further, said goodnight, I said "I love you", she replied with "good night" again. I challenged it, she said "I won't say it because we are not on the same page".

I had like three minutes to think about how the plan was to soft next and if it failed, break up before a trip we'll make and in which she's much more interested than me, if I have any interest at all (it goes both ways but it's a first time we'll do together something that in unappealing for one of us). Then she called and apologized for being an ass to me. She didn't say "I love you", I said, and she replied.

This morning I mentioned it and she got defensive, "you're starting already?". I stopped pressing, made some jokes to ease it, not sure about how effective but she didn't sound pissed.

I'm asking here because it's impossible to get guys at askTRP to consider that I might want NOT to hard next because of something that isn't enough, yet, to mark a pattern.

I can clarify this if needed. I went with the general idea since I'd get lost on which details I should bring up or not. Am I missing something or is there some bad flaw in how I acted?