How to 'renew' spouse's L2 visa

[czhe]

My situation is like this:

- I got my L1B visa in Feb when crossing US border from Canada.
- My spouse got her L2 visa at the US consulate in Canada, after my L1B was approved.
- Unfortunately my passport expires in May of next year. I was told to get a renewed passport, keep my old passport, and then both along with I-129S when crossing the US border next time to 'transfer' my L1B visa into new passport.
- My spouse's L2 stamp currently shows an expiry date of May (based on my initial passport expiry).

My question is: what does she have to do? Does she just cross the border with me next time when I present my new and old passport and they will 'update' her visa as well?

Thank you.

[newacct]

Yes, the easiest is (if her L2 visa is still unexpired) to leave and re-enter with you or showing your L1 I-94. Alternately, she can file I-539 for Extension of Stay while within the US, which will cost several hundred dollars and take many months.