Cute modest plus size dress for Mob?

Hi all! My mother is starting to feel discouraged trying to find a dress to wear to the wedding. She doesn’t normally dress up but she’s very excited to get her hair and makeup done and she wants to look good.
I just want her to feel comfortable and beautiful in what she’s wearing, so she has full say in the dress. I’m just helping her find something because she’s having trouble. She’s a senior citizen now and has never liked flashy clothes but she absolutely hates MOB dresses with the little matching jacket.
She likes fabrics like chiffon, something with movement
Sleeves are a must, she seems to like flowier ones like kimono sleeve shape.
Maxi or a tasteful high low(below knee)
No low necklines but she’s fine with wrap dresses
Plus size(I was going to suggest Lulu’s but they don’t have plus)

Do you guys have any store suggestions I can check out?