Is calling somebody while taking a bath flirtatious?

I genuinely can't tell if I was supposed to make something of this, but I've had one (M) friend tell me it's platonic, and a (F) tell me it was a subtle way to make me think about her.

Basically, a girl I've been talking to for some time now called me yesterday, then told me she had to hang up so she could "run her bath and call me once she's settled". As promised, she called back and said "okay i'm in it now, so how are you!". I thought it was a bit odd to call somebody and verbalize you would be bathing, but one of my friends insists it meant nothing. Any guidance on this? Was this a subtle sign that I didn't pick up on?

Is calling somebody while taking a bath flirtatious?
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