Your mom bought a loudspeakers from an all-in-one home theater kit. On their own they are useless, and trying to find some compatible system will be an exercise in frustration.
Speakers like this are usually left over from a surround kit where the DVD player/amp went faulty. The speakers get sold off and bought by people who don't realise that they're useless without the matching player/amp head unit. You can cut the plug off, but the speaker still won't work well with any aftermarket amp. The problem is a low Ohms rating.
Honestly, cut your losses. Either get your money back or junk the speaker. You'll waste far more cash trying to polish this turd than it's worth. Either buy a soundbar (an all-in-one sound system) or a complete home theater kit.
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