I think if you have the opportunity to do something positive for yourself you should. A week isn't that long. I DO not recommend taking her with you, you need time to be alone/with your friends. She may not be very happy about going either. Having her in her comfort zone is probably the best thing for her with your mom.
We as mom put a lot of burderns on ourselves to always be there for our children, which to a degree we should be, however we forget about ourselves and our own well being.
I have heard so many times over the past few years you have to do something for yourself and will be a better mother for it. Pump enough ahead of time and have it stored in the freezer if you are concerned about the breast milk. At 11 mos she will be getting a lot more solids anyway.
Yes, it will be hard, probably more on you then your daughter. She will be fine. If you are trusting of your mom to follow your routine, she will probably really benefit and enjoy that special time with Grandma.
Don't stress, try hard not to. Don't let anyone make you feel guilty as I think it is a great thing to get away sometimes, it honestly gives your daughter security in knowing you will return when you leave. We get so self sacrificing sometimes that I think we don't realize how refreshed we will be when we return and be better moms. They say a happy mom results in happy kids!
I am guilty in 3.5 years of solo parenting never having left my kids overnight (they have had sleepovers) or taking the breaks as often as I should. I realize now that if I had the opportunity and had someone I truly trusted to watch them that I would come back so much more patient and relaxed probably! :)
I have a friend that had her daughter stay at her grandparents for five days, she was so worried but she said she was so renewed at parenting when her daughter came back and it was a very positive break for them both.
11mos of age they have no real concept of time, just their routine. Three days won't mean anything more to her then seven, promise! Have fun, relax and keep us posted! :)
It will be harder on you then it will your daughter.