Sometimes it can be a comfort latch.
For that 10mins, is it an active sucking?
Usually night time for the early months, they will be feeding constantly and non-stop thats why some mother gave up breastfeeding due to this.
Fussing could be due to gas in the tummy. Burp her or do some tummy massage to rid the air in her tummy.
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Bad Mum, Kudos to that.