How can I gently remind my mother that Islamic guidelines are timeless, not extreme?

Assalamu alaikum, I’m really struggling to talk to my mum about some of her choices without making things tense between us. She often says “things are different now” and that we don’t need to be so strict, so she’s quite casual about things like remarrying without proper Islamic boundaries, staying out late, and traveling without a mahram. I want to advise her because I care, but as her son, I feel like anything I say will just sound like I’m judging her or being too rigid. She knows I’m uncomfortable with some of her actions, but she tends to brush it off. I haven’t pushed the conversation much-just mentioned my feelings-but it doesn’t seem to make a difference. I know I can’t force her, but it hurts to see her take this lightly. Please make dua that Allah guides us all and softens our hearts.