i have an english staff x american staff 2 days ago she contracted the parvo virus ,from another pup i had?

ok my female dog contracted parvo from the brother pup i had that we had to put down because he was so disstressed an sik 4days ago,she is in the vets i got her there 2 hrs after i noticed that she was trying to spew,she is on iv an atibiotics an around the clock care,up till this mornin she seemed to be fine no diarea not much vomiting an pretty well ok,but this mornin the vet rang to say she is flat an wont eat an has diarea,didnt say if there was blood or not,they had tested her white cell count yesterday also that came bak all good. her heart rate an temp seems to be fine this is her 3 day i got her early wat do u think the chances are she is around 17 weeks old
also me an my 6 year old daughter went to see her last night an she was the same ol biting pup that we new befor e i noticed her sick ,wen we went to leave she started tryin to eat the metal bars to get out of the confinment ,she was here well self until i got the call this mornin it apparently started at around 3 oclok this mornin
also i would like to add that yes today i thoroughly went through my house from top to bottom an bleached everything in site,my vet said this was a very good thing to do,i just dont no how she could go from good to preety good then bad?pls help i lost her brother pup couple of days ago because i didnt no the symptoms an wen i took him to the vet 24 hrs after he was weak an had no hope i put him down humanly because i lover them both but i dont think i could handle havin to see this again
an yes it is up to 1300 already in the bills but i dont care i just wanna no if im saving her life an doin the right thing,or has she no hope to an needs ethinased to ,i dont wanna have to do that though ,i have ssen alot of people say that with proper vetinarian care they can survive an i am paying top dollar she is also on two diff antibiotics also
im just wondering if any one else has been through this an what was the outcome?