Apologies in advance for yet another "which laptop" thread!

I'm looking at buying a laptop for my wife for when she sets up a small business; as per advice in another thread, I've been looking nearly exclusively at HP products.

(To re-cap: she's after light-sh and portable, no smaller than 13", decent resolution, SSD; doesn't need to do anything too taxing beyond Office-type stuff, and won't be installing many apps beyond Office or storing much on it.)

Specs: will 128GB / 4GB be adequate for this purpose? Or should she find the additional few hundred to get 256GB/8GB? (All laptops we're looking at are i5.)

Model: she's kind of fallen in love with the Spectre X360 range, given they meet all her criteria, have the flexibility of functioning as a tablet (potentially useful when working with clients), as well as being a stunning aesthetic object. Extending the warranty out to three years, to bring it in line with the Elitebooks, is less than $100.

But I'm not sure if the older and recently discounted models like these $1477 or $1564 ones, with the 5200U processor would be adequate, compared to the more recent $2000sh (after discount) model with a 6200U. That's a lot more money for an otherwise similarly specd device - I'm thinking they'll be fine, but can anyone offer their views on this? (I've not seen those older models with anything other than 128GB/4GB).

We've also got quotes for Elitebooks, with the cost of a similarly-spec'd latest gen 840 being over $2k; but given her intended use, and that she'll look after it as it's her own device, will a  Spectre be ok for her purposes?

OS: should she ensure it has a pro version of Windows, or will Windows Home be ok (given it'll be a one-person business)?

Many thanks for any advice.