Not registered as a director no
https://beta.companieshouse.gov.uk/officers/SVc0y7rK_YSFofafa1l4U8PO0xk/appointments
https://beta.companieshouse.gov.uk/company/SC526076/officers
In case you don't trust the links for fear of dodgy websites:
Lee's directorships
View attachment 1931
And the Meldrum company directors
View attachment 1932
All above freely available under public access on the Companies House website
It seems that she has primary control over the business - nothing too unusual about that
Registered addresses will be accountants etc - don't go pestering them they just represent clients
The fact they had another vlogging channel yet only have one company registered is perfectly normal. Another channel can simply be regarded as a trading style of the other channel etc
To be completely fair they have unlike some other vloggers to have registered quite early on in their vlogging careers