My Mum (55 yrs old, obese) has just been diagnosed with Type 2 Diabetes and she’s freaked out about what she can/can’t eat. Are there any simple meal plans for Diabetics?

Not sure if this is the best place to ask but Reddit has always been really helpful with things I’ve got no idea about. Any advice would be appreciated. I know she must stay away from sugar and she has to exercise at least 30 mins per day, but what meals do diabetics often cook? She’s currently only eating chicken breast and steamed vegetables but I’m not sure what else is good for her.

Thanks in advance!