Damaged phone.

I bought my mother a Huawei p smart for mother's day but she dropped it down the toilet a week later so i replaced it with a Samsung for her. The Huawei seems to be working as in it rings and i can take a call but the screen is black the whole time. I brought it to the local gadget repair and he said he really only fixes water damage to retrieve data as the repair may not be reliable. Fair enough. Just wondering does anyone think it's worth repairing or will i retire it to the scrap heap