I am not sure about the re gurge it is something to keep an eye on for sure.
The shed cycle is about 10 days from the first moment of starting to the final shed, it varies a bit but generally is ten days often the beginning isn't noticed. There is a period of slight hazy appearance then a red/pink tinge to the belly this deepens and the hazy fall to milky with milky blue appearing eyes. There is a partial clearing that follows the redness reduces or goes away and the eyes seem to clear there is often still a subtle hazy appearance to the skin. That is followed by the the shed itself.
Your animal might just be in the clear stage, or you may have missed the signs. I'd guess that Marley is just cleared and will shed out in a day or three.
Keep an eye on her about the regurge however there are a lot of causes some external (stress rough handling prey to large too cool temps ect.) but some can be internal as well (parasites, disease ect.) it appears that your temps and such are fine so either too much food or too frequent feeding might be it but also internal problems too or she just up chucked a meal. Just keep an eye on things if she does it again then worry just track the husbandry and keep notes of what was fed and when if you don't already it will make problem solving if it is needed easier later on.
Some snakes will eat during a shed, that is fine as long as it is not too big if you offer during a shed offer small or not at all. The skin about to shed is not as flexible as new skin and if fed late in the cycle it can cause a obstruction that the snake cannot manage to get the shed over. That can cause all kinds of havoc as it dries out and contracts. It is rare but has happened. Light feedings during a shed or non at all.
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