Firstly hun, I'm sure you will be able to keep breastfeeding your DD, it just might take a bit of organising. Even if you decide to introduce solids early (which isn't recommended) she may not be ready. I started at about 5.5 mths as she was showing all the signs - but she hasn't really been 'eating' until this week and she'w now 7 months, so I wouldn't count on solids tiding her over.

How often does she feed right now? I would say a 4 hourly routine is workable but that would mean a feed at 730, 1130, 330 - so it might mean 2 bottle feeds of EBM when you aren't there. I am doing the same thing - going back part-time but I will have to have her brought to school for a feed as she won't take a bottle.

Sorry I feel like I'm not a huge help but there is also information on the ABA website about working and feeding. HERE is a link to the ABA website and just follow the links to working and breastfeeding. They also have a pamphlet you can get about it. HtH and good luck!