The Birdy exist with two stems, the 21 degree sport stem and the comfort 10 degree stem that has a shorter reach.

If your spouse has a Birdy with sport stem, a Birdy with comfort stem should fit for you.

The Birdy stem has two positions, one with a longer reach, another with a shorter reach, see :
Riese & Müller Birdy come ex factory with the stem on the longer reach position, you might try the shorter reach.

Another excellent folding bike with a short reach is the Tyrell Ive