Agree with Kate; it's normal for their sleep to change as they are going through so much eg immunisations, sleep regressions, teething as early as 4 months. Try not to stress too much; it sounds like she is still doing a good stretch at the minute x
My baby was up every 2/3 hours for the first three months, there’s no such thing as a routine until they’re about 4 months old and that’s when if it changes there may be a reason for it (teething, cold, hot etc) x
This is exactly my little one at the moment! It just switched one night and now it won’t change… we try everyday to try and get him back to sleep but never will! Really confusing as to why🫣🤔xx