According to the plaque, the tree in the title was planted by her friends in memory of one Suzie Edney, who died, aged 19, in 1993. They found a lovely spot for it.
Note: to get back to the road, you can either climb the gate at the bottom of the field (the route in blue on the map below ... a bit naughty!) or be the good citizen and follow the footpath that joins a little further south.

Suzie's Pine is one of eight caches around Cowley County Parish ... why not get out there and see them all! I recommend tackling the circuit anticlockwise, starting/finishing at Cowley Village.
PS: to finish off, if you fancy a pint and still have a little bit of energy in those tired legs, then you may enjoy the walk shown below through Ward's Wood to a nearby pub. Watch out for the noisy ducks as you enter the wood!