Chances for Purdue to make the Dance are dwindling, but not dead.
With Indiana losing and taking the 11 seed, Purdue has a chance at two known top-half Q1 wins. Beating OSU and then MSU would get them to 18-15. Losing to Maryland and finishing 18-16 might still squeeze in.
I think three wins in a row would be a lock. If it's over Maryland, obviously that's a huge win, but I don't think that's a very good matchup. Over PSU would be a very good win, and I think PSU was riding high when they played Purdue but I don't know if they can sustain whatever was fueling their 3pt shooting that day. Over Indiana might still be Q2 although they'd be coming off a three win streak, but I know Purdue, if it's confident of anything, it's that they can beat IU.
If Purdue gets to Sunday, they're in regardless of outcome. I think the selection committee will create a single bracket that has Purdue somewhere around the 10/11 at that point and they'll get that seed win or lose, and the same for whoever they face--their seed won't depend on beating or losing to Purdue.