Nursing strike- help!

Jaz • Mom to two beautiful daughters and another on the way!! Happily married for 9.5 yrs.
Baby girl turned 21 weeks - she was a perfect nurser out of the womb.  She has taken bottles and pacifier also since a month.  Now that I'm back at work (7weeks now) - she has done great between boob and bottle.  She mostly gets bottles now - but would still nurser at least once or twice each day (and a week ago I was home for 4 days and she strictly nursed).  Now - bam - won't take the boob.  In fact she looks disgusted when I offer her the boob.  It's been about 3 days now.
Things that have changed in the last few days:
-just finished up my second pp period
-we just got back from a 2-day trip away from home (she came w us)
Anyone been through this? 

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