Hi New Shoes,

Yes, that's correct. A minimum score of 36 in both listening and speaking is needed
to achieve the required B1 level

It's extremely unfortunate that she misses out by just 2 points and this results in the need for a re-test.
I guess if there's any positive in this it's that she's been here in UK for 2 years and likely improved her capability greatly. Means she'll easily make the needed grade.
With that in mind I'd suggest you review the latest UKBA Listing of Approved English Language test here with a view to locating the nearest low cost test & test centre.

BTW if you take a look at page 30 you'll be able to confirm the PTE test scores needed