hi Billip - sorry to hear of the loss of your Gran - I remember mine with immense affection, so can understand your wish not to 'give away' these things for which she had such passion.
However, we have to be realistic, and collectors will not appreciate those sentiments you obviously have for her possessions. Modern coloured glass is not my area, but I don't see anything there that will cause collectors to have sleepless nights, and it's probably unrealistic to expect one buyer to want all of Gran's glass.
My opinion would be that weighed against the possible total sale value, the costs of packing and postage etc., might well mean that you are not be looking at much return.
May I make a suggestion - just my personal opinion you understand - but had you considered donating these pieces to a charity shop - a charity that might have held some meaning for Gran - did she have a cat or dog for example - in which case perhaps you might consider the RSPCA.
At least this way, there might be some satisfaction that Gran's lifelong passion would be directed to a good cause.
Whatever happens I wish you luck.