First concern you should have is with handling people's feelings. Legal issues are just a background for knowing what practical actions are fair or not.
Ideally, none of you should use private equipment in the workplace. If the clipper was the company's property, then the law varies by country, but you should generally not expect to pay for it unless it was damaged by gross negligence of your part. Employers need to know and prepare for accidents and not try to get their employers to pay for damages that will eventually occur. Consider the scenario where your job is to walk a bull around a heavily packed tea pottery shop. I'd bet every single day the bull would break a few items, and nobody would accept this job if it meant paying for all the damaged products. Same goes if you lose a finger when handling a machine, it's the company who should compensate your loss, unless you handled the machine recklessly.
Now, the frame changes if you broke your colleague's equipment. She should take caution to keep her items safe and be able to live with the loss of anything that's subject to be broken due to unfortunate happenings. Chances are, she's not prepared for this either.
You have started well by showing a token of good will: You've paid for something that mitigates part of the damage caused to her. But of course, a whole new item is a lot more convenient for her. You should have entered a prior discussion about how you both proceed to avoid such accidents and how much each of you could have acted differently to avoid this one.
If during this conversation you find out that you indeed were in gross negligence (i.e. there was a procedure you were informed about telling you to put all sensitive equipment in safe places), it would be fair that you'd pay for a new item if needed be. If you don't have the money, then propose that if she buys one (with your prior approval) you will repay her in installments. If she does not have the money either, find a polite and elegant way to tell her that she should not depend on equipment she cannot replace/repair. Seek the boss to get equipment for the company in the worst case.
If this was partially her fault (i.e. she left a $250 tool on the corner of a table, knowing it would break if it felt to the ground), you've done your part already. But be nice to her, loosing ~250 bucks is stressful.
Also remember that this isn't the place to seek legal advice. Seek a lawyer if you need one, but I doubt your case will get to that point.