I've noticed this as well! Maybe she's like Sable and becomes more friendly the more you speak to her or buy items off her? I know that after some time of buying items she gives you a mannequin. Maybe it means you're getting closer to that.
UK timezone (ACC time +5 hours) : Meowth, that's right!
Labelle definitely gets friendlier the more you purchase from her. I purchase anything new (even if I don't like it) so I can have a full catalogue. She's so much nicer now than she used to be! Keep purchasing clothes and accessories and talking to Sable and you will get the 3 mannequins pretty quick!