Sujin always points to the Dhamma as laid out in the Tipitaka and Commentaries as the only reliable guides. Not her teachings or anyone’s except the Buddha and the great ancient bhikkhus.
Of course when she was young she had a teacher, Ajarn Naeb Mahaniranonda ( died 1983) but later studied by herself when she found aspects of the technique- like all techniques- somewhat contrived.
I spent a few months at the ajarn Naeb center, it is still there, but like Sujin I find more interest now in what is here and now anytime.
Hoping to find a teacher, a system, a lineage, we can follow who will tell us what to do it is possible to get trapped in some wrong way. It can be quite subtle. ( of course asking questions and discussing with wise teachers is good).
So we , as Buddhist, are not searching for some special technique that suits us, some teacher who tells us what to do. Rather we take the Dhamma as our refuge and start to learn what satipatthana really is…
The investigation of Dhamma is not like a scholar studies but is studying life itself.
I was in Sri Lanka 7 or 8 months ago and listened to ven. Maggavihari talk on Abhidhamma at a large vihara. Many young bhikkhu were there and some good questions were asked. This is the way it should be: listening, studying, questioning respectfully, contemplating and above all seeing that Abhidhamma is daily life.