Sonny, it takes time. You mentioned Tabs is spirited - it took me a long time too with Ryan. But stick with it. Crying it out I really don't feel is a good option, she is also way too little for it.
Whatever you decide to do, stick with one method because you can confuse baby by changing what you do. Give Tabs a chance to get used to one method. It was about 16 weeks before I could put Ryan in the cot and leave him to sleep on his own. And I still need to help him when he is teething and hitting different developmental stages, but it doesn't take anywhere near as long.
I promise it gets better though.
If she is already stirring at 35 mins, try going in at 30 mins before she stirs.