A bedside step stool can help her reach a comfortable floor position at the bed edge, but it is only one piece of stop one. It is also a floor object, so its cost depends on what it has to do and where it has to sit. Start with the parts that change the price, then check the stool against the route before you buy.
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The height of the top step
The top platform height decides whether the stool helps at all. A stool that is too low leaves her reaching down, and one that is too high can be harder to step onto. Measure the height of her bed edge with her usual slippers on, and ask the seller for the top platform height in the same units. Higher platforms and wider tops usually cost more because they use more material.
The base and the feet
A wider base sits more steadily on a bedroom rug, but it takes more floor. Look at the feet. Rubber or non-slip pads on the bottom are a stated feature, and you should ask what they are made of and whether they are replaceable. Feet that slide on hard floors are a common reason a cheap stool becomes a problem.
The grip and the rated weight
A handle or a grab rail on the stool adds cost and can add a second point of support. Check the stated weight rating, and ask whether that rating is the limit for one person using it, not a figure for the whole stool when loaded with a bag or a box. Do not buy on a weight number you cannot confirm in the seller's listing.
Delivery, returns, and warranty
Shipping, return fees, and the length of the warranty are often where the real difference lies. Ask whether the stool can be returned if it is too tall or too low, and who pays the return shipping if it is. Write down the warranty period and what it covers, then keep the paper with the order.
Check it against the route
Once you have the numbers, place the stool in the room and walk stop one to stop two with it there. If it sits where she needs to walk, or the lamp cord runs under it, the cheapest stool is still the wrong one. For how we check product claims and sources, see Sources.