The Umbrella Academy's Emmy Raver-Lampman explains why Allison made that deal

gamesradar.com:

The Umbrella Academy season 3 sees the Hargreeves siblings return to 2019 after their accidental stint in '60s Dallas, but things still aren't completely back to normal. For one thing, Allison is mourning two different lives – the one she left behind in 1963, where she was married to civil rights campaigner Ray (Yusuf Gatewood), and the one she failed to get back with her daughter Claire thanks to the paradox affecting the 2019 timeline. This grief clouds her actions for the duration of the season, and Emmy Raver-Lampman, who plays Allison, has explained the motivations behind one decision in particular. 

There are major spoilers for The Umbrella Academy season 3 ahead, so click away now if you haven't caught up with all the new episodes yet.

In episode 8, Five (Aidan Gallagher) overhears Allison making a deal with their father, Reginald Hargreeves (Colm Feore). We still don't know the exact terms of the deal, but we can imagine it has something to do with Allison somehow reuniting with both Ray and Claire in the same timeline (it was previously revealed that Ray died in 2010). 

"We spend the whole season with Allison kind of spiraling the drain with the loss of Claire and Ray, and then dear old Reggie kind of opens up a window and is like, 'Hey, you could change all of that and get not just Claire back, but potentially Ray as well,'" Raver-Lampman explained during Netflix Geeked's The Umbrella Academy: Unlocked. "And I think at that point, she's so done with her family and she's so done with Viktor and she's so done with all of them that she's willing to risk it all."

Allison and Viktor (Elliot Page) come to blows when she realizes her brother has been lying to protect Harlan Cooper (Callum Keith Rennie) – Viktor knows