Please do not tag your questions onto other members topics, it is unfair to original posters and creates confusion when members respond.
What if I switch job from my Tier 2 sponsor (after I got my ILR), while dependents still have Tier 2 dependent visa?
If you get ILR based on Tier 2, there is NO issue regarding dependent!!
My daughter was born in the UK, now I got ILR (from Tier 2), I'm planning to get her naturalised via MN1 Section 1(3),
Children are REGISTERED as British not naturalised (adults only).
but now I'm also thinking about switching job. Will her current visa (Tier 2 dependent) remain valid?
No. Your dependents are dependent on
YOU and not on your sponsor. Their visas remain valid as long as you got ILR based on Tier 2 and not 10 years long residence.