The Beinn is not a real step through, I imagine she would find it difficult to get on the bike.
I have been selling hundreds of Petites for about 5 years. I know it is perfectly suitable for 5ft2 riders but because Paula does not ride a bike at the moment, so it's not possible to be absolutely sure.
If you check the saddle height of your bike against the 76cm-78cm on the Petite, you will see that the Petite is not high.
