I am ready to tear my hair out!

My daughter is 15 months and in the tallest percentile. She has a peg perego prima papa highchair which she is too tall for the shoulder straps.
Does anyone know of a high chair with straps that suit a child the average size of a two year old? She won't sit in a booster successfully ( keeps climbing out).

I'm also pregnant, so am now looking for a double pram.
Seems like there are pro's and cons for all types, ie tandem or double.
The strider 4 ( with the toddler seat at the rear/ underneath) seems to have the tallest seat available for our daughter but a lot of people seem to hate these for the fact that toddlers don't like the lack of vision.

I'm getting frustrated....

Someone out there in forum land MUST have found themselves in similar situation?!