How do sandstorm happen?
When Momentum builds up when wind attracts sand, sand will gather up and will seem to cause a "Sand Avalanche" and will roll over through land.
Some say she will become an elder, others say she will lead the clan. She would not lead the clan, because she is not the deputy. Brambleclaw will lead the clan when Firestar dies, because he is the deputy. When Firestar dies, Sandstorm will continue to be a warrior until she dies or decides to retire.
Knowing that a blizzard is usually in freezing temperatures and sandstorms are in warm to hot temperatures, they would never mix. So the question is in correct and could never happen. But in the impossible accurence, the sandstorm would win because the heat from the sand would melt the snow and would make clumps of wet sand.
At first Firestar loves Spottedleaf, but then Spottedleaf dies, so he starts liking Sandstorm. In Firestar's quest Sandstorm thinks she is only second best a backup. But then Firestar says that Sandstorm will always be his number 1 love. They then have two kits Squirrelflight and Leafpool. And Firestar will probably love Sandstorm in Starclan much,not Spottedleaf.