F.W.
Sounds like you need to do some soul searching--
If being a full time mom is remotely possible, you may want to consider it--not because your baby will necessarily be better off but for your own sake. Discuss it with your husband--can you downsize at all? Is there some other kind of part time work you can do from home or when your husband is at home to help contribute financially.
If that is not possible or not what you really want to do--rest assured your baby knows you are mom. Is she going to form a bond with the nanny/helper--of course and frankly that is completely desirable! As a daycare provider I can reassure you that children can be bonded to you as mom and still have a good relationship with me. There will be ups and downs even after your feelings settle down. One of my infants went through a pd of sep. anxiety where she wailed loudly for her mom and she had never cried when mom left before because I've watched her since 2months of age. She then went through a phase where she'd be super excited to see mom return but when mom put her coat on she'd reach out her arms for me instead. Does she call out mama to me sometimes --yes but that doesn't mean she truly thinks i'm her mom--at this point mom is ladies that give me food ! I'm sure we'll cycle through phases like this for awhile. Its all about transitions--kids don't like them and are especially sensitive about them at certain periods of time. If you are popping in and out during the day it could be confusing to her. If there is anyway to routinize your visits it will help. And--kids are always more fussy for their mamas--mine included. She is the toughest kid to deal with in my daycare :) Good luck and rest assured she is bonded to you:)