While some things may follow a general progression, the timing and order will be different for everyone. My dad is approaching what might be termed Late Stage, Alzheimer's, but, while many no longer speak, he is still very good at talking.
Regarding food, is she on her own? Does she eat on her own? Dad found anything that required effort to chew was just beyond him. He also got to a stage where he needed a spoon, very tiny bits of food, and constant reminders that there was still food on his plate. Depending on her situation, she should have food provided and prepared for her, and someone to be with her when she eats. Eating is also exhausting for Dad, it requires great mental effort, so they need to graze through the day. Little and often, and at a certain stage, it's not so vital for a balanced diet, they need the fuel and calories rather than super healthy choices.
And yes, you're so right, Jessbow, they really develop a super sweet tooth, Dad rarely needs reminding to finish tapioca custard and stewed apples.
Akadog, it is hard to get answers from the dr for these problems and many GP's may not even be very clued in on this type of care. You should get some more great info and advice here, and perhaps talk to her care providers if she has them, they are far more experienced in aged care than drs.
Take care, Stephanie