Find an alternative - like something clip-on or magnetic. Your mother makes reasonable points and is unlikely to change her opinion, so you might as well make the most of your desire for self-expression while still avoiding conflict with your primary provider. Given the small surface area of a piercing hole (vs something like a tattoo) it'll be easy enough to hide by just taking out the jewelry if you do end up getting one. The biggest issue would be the healing period, during which you'd have to keep them in at all times. The reason I'm bringing up the hiding issue is related to employability. A lot of businesses rely on an image they insist that their employees reflect, especially in jobs where you interact with clients directly. It's only natural since most clients would interpret and judge personal displays in alignment with the values of the firm-justifying imposing a business formal code of dress and mandating the lack of visible body mods or stuff like religious displays. Even in contexts where you don't interact directly with your client there are still rules regarding wardrobe and accessories: in many cases they are an unjustified but nonetheless integral part of working in an office. The stricter and more rigidly enforced hierarchy, the more they stick to the dress code-it's part of that work mindset that they try to invoke and distinguish. While there are some professions where body mods are not going to stand in your way (eg if you were aiming for working for NASA-and generally science subjects) in most cases you will have to deal with prejudice. If your interviewer is biased, then he's unlikely to hire you. If your interviewer is not biased but still aware of a general negative perception of body mods within the company or particularly among upper management, he won't hire you because it would probably become a point of friction at one point.
In the end most jobs requiring a university degree will judge you harshly on how you choose to present yourself. And it may be unfair and unjustified, but prejudice usually is. But the job market is not exactly flourishing and your mother is trying to look out for you and spare you the difficulties that you might not realise this would bring in your interactions with most people. There are non-permanent alternatives, so go for one- you're young and if you think it'll look good, it probably will- but you can find out without the pain and soreness of months of healing the job of the parlor that didn't think to check your ID.