My friend thinks I was talking crap about her?

She thinks I was talking about her negatively, when really it was just out of frustration. Not meant to be a full on smack-talk. She was in the bathroom stall, when I was talking to two of my other friends about it. I don't know how she came in without anyone seeing, but she did. Anyways, I was talking about her relationship with her boyfriend and how it's unhealthy that they're always together and that it pisses me when she ditches me for him. It seems to happen a lot. They are together literally 24/7. Everyone I try to make plans with her, she cancels last minute. Sure sometimes it may be it's reasons, but at least 60% of the time, it's because of her boyfriend. I both of them as individuals, but this relationship is unhealthy and ruining our friendship. She will not listen to me and just thinks I was running my mouth about her. For example, I'll be with her and as soon as her boyfriend comes over, she leaves or they just stand there holding each other, faced towards each org, ignores everyone else around them, personally I think it's rude. What should I do?
My friend thinks I was talking crap about her?
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