Urgent advice please

I got another girl today (Copper Black), .  I only have one run and coop, so today she has been in the run the guinea pigs use in the summer, one of those big collapasible ones with the cat carrier we borough her home in.  She has been fine the other girls have all met her walked round the run etc.  My problem is now, at night, i have put her back into the cat carrier and put her in the tool shed as it is blowing a gale here, but i have just gone and checked on her and i could hear her walking around in the box!  I'm wondering whether she NEEDS to roost?  I am thinking whether to put her loose (with the box incase she want to get in) in the greenhouse, but i'm worried she will get cold (as the lady mentioned they aren't great in freezing conditions) being in a more open space on her own.  Its not a glass one, its one of those small double walled plastic ones.

Do i leave where she is, but will she get stressed??

Do i move her to the greenhouse, but will she get cold??

Any advice please

Thanks

i could do just thought that would be more stressful for her, with all the smells of cats and people