HIs it ok to travel to India when h1b extension is pending ?

My wife(H4) and me(H1B) have a I-94 valid till 27-Feb-2019…She is planning to travel to India this Oct and planning to come back around mid Feb . My employer might file a extension around November.

Would her I-94 status and entry in US be affected, due to the extension filing (I am assuming approval wouldn’t come in 3 months) ?