Does changing bed routines effect your child. ?

I'm a single mum, so have an excellant routine with my ex , my daughters knows where she will be, BUT due to so many circumstances and especially my work I have had to change her bed routine a number of times.
Ie: I was working 1 day a week so I didn't find it a major issue to let her stay up an extra half n hour here and there, because it wasn't like we had somewhere to be in the mornings. Then I moved in my job which meant longer hours and her sleeping at work. She adjusted but I felt bad and moved on from that job. Then I found a FT job which was early start, but freed up my weekend with her. She started to fall asleep beside me then I would put her to sleep in my bed or her own. Now that she starts school I want to change it again to same time each night, with a book before bed, in her own bed. My daughter is an awesome sleeper can sleep for 12hours, but hates not being close to me at sleep time. I know it's going to be a pain, but am trying to tackle it before the school start.