A power recliner is a chair that tilts back and raises the seat, and it needs more room than an ordinary chair. The question is not whether it looks right in a catalog. The question is whether it fits her height, the wall behind it, and the outlet its cord will reach. The fit question is about her, this room, and how she gets in and out of a chair.
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Start with her, not the chair
Ask her, or the person who helps her most, how she sits and stands now. Does she push off the arms, use a cushion, or need a seat that sits lower? Note the height of her knee when she sits in her usual chair, the depth of that seat, and whether she needs to reach a side table from where she sits. Those notes tell you what seat height and arm position to match. A chair that suits a taller person can leave a shorter person perched too far forward.
Measure the room the chair will recline into
Measure from the wall to the front edge of the spot where the chair will sit, then allow room for the recline. The back of a recliner moves backward, so the gap behind the chair matters as much as the gap in front of it. Measure the width of the spot and the path she will walk to reach it. Mark the footprint on the floor with tape so you can see it from the sofa and from the doorway.
Check the outlet before anything else
Find the outlet the chair will use and check that its cord reaches without crossing a walkway or sitting under a loose rug edge. If the outlet is behind the spot, ask whether the cord can be routed without a long run along the floor. If the outlet looks loose or does not seem to suit the chair's power needs, ask an electrician to look at it before you buy. Do not plan a chair around an extension cord.
Test the chair in person when you can
Ask her to sit in a similar chair at a store, a friend's house, or a showroom nearby. Watch how she gets up. Check whether she can reach the controls without twisting, and whether the chair tilts clear of the wall. If you are buying online, ask the seller in writing for the exact recline and footprint measurements and for the return terms, then compare those measurements to your tape marks before you order.
Tonight
Measure the wall gap behind the chair spot, the distance from the spot to the outlet, and her seat height from the floor when she sits in her usual chair. Write the three numbers on one card, keep it with the house folder, and send a copy to whoever is helping you choose.
For the doctor
Ask her doctor or physical therapist whether a chair that tilts and raises suits the way she gets up and down, and whether she should try one with someone present before buying. Bring your measurements to that conversation.