If her tests come during her luteal phase, if she’s nagging or provoking you about money, emotional availability or even how she wants to live closer to her parents, it’s likely her insecurity is based on her perception of your status, provisioning capacity or your Beta Bucks potential to make more of it.
I can't count how many times I've seen girls bolt to their parents or to a "friends" place when things get rocky. I had a friend who left behind an incredible job to move closer to his wife's family, supposedly for help with the kids and more free time. But really so that his woman could get a boost to her own career from good old fashioned nepotism.
It played out predictably. Her family connections made her a big fish in a small pond and she was surrounded by more successful men. An appropriate amount of time passed for "irreconcilable differences" to be believable and she initiated the divorce and moved herself and the kids in with her parents.
My friend is now living in a less than ideal place with fewer career opportunities, all to be closer to his children. The woman remarried to a man 20 years her senior, whom she was most likely cheating on my friend with while they were still together. She has an incredible life and my friend maintains a home three times as large as he needs for weekends with his kids. Technically he could see them more, but the ex is "very understanding" about his situation and knows that he has to work and commute throughout the week.
Don't fall for the siren call of comfort. There shouldn't be a window of opportunity that snaps closed on familial support. If it's there now, it will be there for you and your family when things get rough. My friend confused his wife's selfish economic decisions for a family decision. Now he sees his kids barely at all and they are spoiled rotten by an interloping male.
TLDR: Unless your LTR's family literally worships the ground you walk on, view them as a threat to your family unit. Their loyalty is to their direct descendants and you are a sperm donor and maybe a convenient wallet. Family Cohesion (when healthy) should be more important than minor windfalls or lateral career moves.