quinn actually confesses her love to rachel at the bridal shop, and then they have a fight about how quinn can’t do that to her on her wedding day and stuff, and quinn just storms out, gets in her car and drives away. [cause in that latest pic, she is wearing the same clothes] 

and after some thinking, rachel sends her a message “quinn, please just please.. you need to come back. we need to talk. i am truly sorry about how i said some things that i didn’t honestly mean, and how i don’t have all these feelings, when i actually do.. i just need to talk you. i need to know if you meant everything you said or was it just to try and stop me from marrying finn, although i don’t see any other explanation for that. if you really did mean all those things you said.. just call me. please. before the wedding starts.. i love you.”

and quinn replies with a “on my way” and before she could hit send, everything goes black. 

so time passes, and rachel tries not to let the tears escape, and the time comes for the wedding to finally start. before she goes to stand next to finn, she looks back one more time, hoping to see her pushing the doors with all force and yelling “i object.” thus, this look.