No air

So I have been working on the road and did a water change on my set up prior to heading out. I have 4 DWC in 30 litre pails. I have 3 Sativa and 1 Indica. My Indica had its air line pinched under the pail when repositioning my plants. They have been switched to 12/12 flower five days ago, when I got home 4 days later I noticed the problem and the plant had taken no water and there was a thick layer of scum on top. I immediately did a water change and provided her with a good dose of Hydroguard. There is still yellowing leaves showing up and falling off, the root seems not as fluffy as my others but now has some new white ones forming. Has anyone else made this rookie mistake and save the plant? What are her odds? She seems to have new growth on the top, but am worried about the overall condition. I am leaving for work on Tuesday morning and returning Friday. Should I give her a fresh water change before that? Or leave well enough alone?

I wish I knew what to tell you (other than that sucks) ..but unfortunately, I have no idea how to go about remedying this. Hopefully someone can chime in with some solid help.

Just Be said:

I wish I knew what to tell you (other than that sucks) ..but unfortunately, I have no idea how to go about remedying this. Hopefully someone can chime in with some solid help.

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Yes thanks, it is a stupid mistake on my part. I think she may be coming around,, there is some new root activity and growth on the top, I was worried about root rot when I saw the water and that still may be a factor. However; I have Hydroguard in there and I know that shit works, I am hoping with time she will come around