Someone splashing in the water.
The woman splashes as she tries to keep from drowning in the river.
Someone is not necessarily be a woman.Someone is splashing in the water doesn't imply she tries to keep from drowning in the river.
Splashing doesn't necessariliy mean drowning and the splashing might be in a bucket of water or just in a pool.
Splashing does not equal drowning in all cases, it may be a playful splashing or swimming. Someone can be anyone and is not always directed towards a women, it could mean man, child, boy etc.