I say NO..
coz she is a farm unit so will show up in daily revivals in coming futre...you can get her then...

Besides Rangers are very situational...
Most maps you will bring Archers and very few cases..(like....bad weather maps...and
majin avent where traps are needed)
you will bring her...

SC can be spent on Lissolette..(plat soilder) if you want to spend any..
otherwise save for the aniverssary..