The fuck off she would've given him for teasing her would definitely pale in comparison to any she gave him concerning Wanda and her delicate nature. Even with the age gap, Lorna considers Wanda her very best friend. She tells her just about everything and so she gets a little upset if anything happens to her.
She and Pietro may even trade insults on a daily basis? He would definitely be able to know if something was wrong with her if he started the verbal sparring match and she failed to reciprocate for any reason other than being focused on her sculptures. That's probably the only time she ignores everything. She gets this tunnel vision when she's sculpting where she only sees what she's working on and only hears her music playing.