Once she reached 18 years of age, she would've been given two options - 1st if she was interested in taking up an apprenticeship the Fund would set aside a Grant and pay until the final year of apprenticeship finished. 2nd - Failing that, if she refused she was removed from the Fund on a permanent basis. Actually something else, her Father died a year beforehand and is buried out in China.Richard, the news report mentions that Lucy had a child, but obviously the child wasn't with her - she was working as a crew member, not travelling as a passenger.
The Relief Fund note shows that Margaret was listed as a person who relied on the income of a victim, and therefore qualified for regular financial support from the fund - generally paid weekly - until she was old enough to support herself. Also confirms that she was not herself a victim, in case you still have any doubts about that.
The photo is on the full biography page. What you have seen so far is probably Lucy's summary page - look towards the bottom of that page for a 'Discover more' link to the full page.
There were 4 (not just 2) stewardesses to serve the 2nd Class passengers - Snape, Walsh, Bliss and Lavington. To accommodate them there were two stewardess cabins in the 2nd Class area - the second was on F deck. You'll find it amid the toilet blocks almost immediately underneath the E deck cabin already mentioned.