Your mom is beautiful! And the fur coat is gorge too!
What is your mom's style...is she cutting edge or classic? Does she work or is she a SAHM? Does she prefer to carry bags in her hand, on the crook of her arm, or on her shoulder? For her, is a purse simply functional or does she carry her life and then some in her bag? It's hard to suggest a bag if we don't know what her life is like. I'm sure you want a bag that will get a lot of use.
The Cambon Ligne always seemed very "young" to me and a little too casual. I prefer classic bags because you can dress them down...but you can't dress up a casual bag...does that make sense?You can't go wrong with the 2.55. You can dress it up or down. I recently bought a tote/shoulder bag that I've grown to love. I can wear it on my shoulders or carry it in my hands.