Hey it sounds like you're making great progress.. so proud of you! When my LO started sleeping better at night..I got less sleep because I was always listening for the usual NWs !!!
Re the yawning and putting down based on that cue...I would probably hold out for the time that you want. Sometimes the cues can be a little misleading after 6 months + very misleading if OT. Go figure! That might get you the 1.5 hours that you need. Just extend the A time with some quiet activity - read a book quietly together or go for a walk outside. See how it goes anyway..you can always try it and then say 'well that didn't work so I can eliminate it as an option'. If she wakes up yawning...I would try and get the extra sleep in..but sometimes that just never works.
Re the meeting..no advice for you unfortunately. When I introduced a new routine I basically stayed at home for 2 weeks - no going out at all (!!!). It will probably mess things up a little but you'll get back on track tomorrow right.
Great that she loves solids. If you suspect that a food group is going to give gas/be problematic..then don't give it at night. Try for lunch but not for dinner. At 7 months I would start to mash the vegies rather than puree - they can handle the chunkier texture and it keeps them interested. My LO gets mashed vegies for dinner - cooked in chicken stock (mmm!). So it's usually low acid content - potato, sweet potatoe, carrots, peas, pumpkin. Then a small bowl of natural full fat yoghurt and a few pieces of fruit (banana or pear). Some bubs get a bit hyped up with the sugar content - mine seems OK.
Re the resettling - yep I know what you mean. I know straight away if it's going to be easy or difficult. Do what works for you...you sound like you know your LO VERY WELL and that's really all there is to it. I think you can take all the methodologies in the world and they won't work unless you can tailor them to fit your child's requirements. It sounds like PU/PD isn't going to work for her as it is too stimulating.. even your presence can be too stimulating.
With time and consistency you will get there...you can already see results right??? Great job..keep at it...keep posting.