EAD extension after Primary H1B job change

[sks0412]

I have filed EAD which is under process from two months and I have 3 year petition with this employer along with approved 140.

I am switching job to employer B who got only one year extension with H1B transfer ,now I have two questions-

1.For how long my wife may get EAD ,one year or three year ?

2.Assume She will get EAD for one year ,Will I be able to file another EAD renewal using 140 from previous employee ?

or I have to get new 140 approved first from employer B to get EAD extended ?

 

Thanks

Sunil Kumar