"There's not a dime's worth of difference..."  

Lisa could have stopped this nomination with a No vote in committee. She's just avoiding taking responsibility for it by kicking the can down the road.  She knows DeVos would be terrible, but this way she can play Pontius Pilate.  "I am innocent of the blood of this just person."

Even if Collins votes no, they need one more vote to kill the appointment. Anyone else would invite the wrath of Trump, who is extremely  wrathful when he doesn't get his way. Her colleagues would be angry. She would lose important committee memberships over her rebelliousness. She wouldn't lose the $40,000 or so that DeVos has given her in the past. She could actually expect DeVos to spend a million bucks to defeat her by backing Joe Miller or someone of that ilk.

The next big vote will be on Gorsuch for the Supremes, who wants to kill Planned Parenthood, bring back coat hangers.