11-32 or 11-28 cassette - what noticeable difference is there?

[double_dd]

Find some proper hills then.

Ha touché.

In all fairness it's a little hard to advise on gearing without knowing OP fitness level, type of hills etc.

What works for one won't always work for another.

 

[Ajax Bay]

without any regard for the numbers at the front

OP:

She currently has an 11-32 cassette mated to a 34-50 chainring which she gets on well with

Let's assume 700c with a compact (but I agree your post #2)