This sounds like just a puppy phase as you have only had her for a week. Everything is new and sometimes new people can be a challenge. From your post I get that that your mother is a frequent visitor so I think after a few more times this will be a” been there done that scenario”. For know, when your mother arrives have her on a leash if she starts to go off, move her in the opposite direction few steps then turn and bring her back. You can try this a couple of times and see if she calms down. Do not correct her just move her, “Lets Go”. Also, I would have your mother approach the pup sideways as to not make eye contact and no talking as to not excite the puppy further and let him interact if he prefers.
If this doesn’t work put her in the crate, no correction just lead her in until she calms down. Let the puppy see you interacting with your mother give your mother a hug, sit next to her, share food. After she calms down let her out and see if she will approach your mother. She can offer her a treat. You do not want to be correcting now because you don’t want her to start associating negative vibes whenever your mother arrives.