To find the current depth of the scuba diver, you can subtract the amount she ascended from her starting depth.
Starting depth: -75 feet (below sea level)
Ascended: +12.7 feet
Current depth = Starting depth + Ascended
Current depth = -75 + 12.7
Current depth = -62.3 feet
The current depth of the scuba diver is 62.3 feet below sea level.