Unfortunately, it could be anything.
Things to look for.....
New construction within a mile or two - You'd be surprised how far they can hear, and the vibrations in the air can be quite upsetting to some animals. Also, reversing beepers at the construction site travel a great distance.
New pets in the area - Maybe even new neighbors
Possums in the trees
Mice skittering around the house
She's not on heat at all?
Something to consider, purchasing one of those compression comforting dog blankets/coats.
I hope you find a solution, nothing worse than having the authorities or neighbors knocking on your door complaining about the noise, been there, dealt with that a number of times.
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1995 Maton EM725C - Solid 'A' Spruce Top, QLD Walnut B&S, AP5 Pickup
2018 Custom Built OM - Silver Quandong Top, Aussie Blackwood B&S, Fishman Matrix Infinity Mic Blend Pickup
2021 Faith Neptune Baritone - Solid Englemann Spruce Top, Solid Indonesian Rosewood B&S, Fishman INK3 Pickup
2022 Yamaha SLG200S Silent Guitar
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