There is something called 6 week sleep regression maybe she is going through that- have a look on Google xx
I'd prepare yourself for ups and downs on the sleep journey until baby is a bit older, I don't know anyone who had a baby sleep through at 6 weeks old and just continue to sleep through forever 😅. Sleep regressions, sickness, teething etc happen. As a parent you have to just go with the flow. Have you downloaded the wonder weeks app? That can help know roughly when regressions will happen. My oldest started sleeping through at 8 months old and he's 19 months now and still does, anyone I tell this says wow that's amazing he is such a good sleep at such a young age so I wouldn't expect too much from a 6 week old personally! Once you accept that babies sleep fluctuates you'll find it easier to deal with
Sounds like a growth spurt and might need more comfort from you.