Just keep being firm and consistent with routine and she will re-adjust. Travel throws them off! Bedtime will keep throwing new challenges at you so set boundaries and hold to them as best you can (as an example, J doesn't sleep in our bed, that's the rule - it sucks when we have to get up to take him back to bed and settle him again but it maintains that boundary). Adjust accordingly when needed, just maintain consistency and communicate every step to her too. Even at almost 5 we still have to discuss every single step of the evening routine every single night and lots of time warnings, planned ignoring, etc to get to the end.