Help!! Jelly hasn't set - it's too wibbly and not wobbly

[unicorn]

Any suggestions...?!!!
(Don't have another one - and need it for dd's party this afternoon)

put it in the freezer for a little while (not too long or it will freeze!)

I'm sure Seona1973's idea is excellent - but if it doesn't work, can you persuade the party guests that it's not actually jelly at all but special fruit-flavoured ice cream sauce?

I made a lovely birthday cake for DS1 six years ago, iced it, put the candles on top then put it in a tupperware box. Bad mistake - the lid sent all the candles sticking out sideways. I just told everyone it was Millennium Dome Cake - and they believed me .

oh good ideas.. thanks!