Originally Posted by Rob

There's lots of potential explanations for this behaviour - it could be connected to a developmental disorder, childhood trauma, experiencing a mental health crisis or the effects of poor parenting like being spoiled. Without knowing more it's hard to even hazard a guess.

You are right that this can be a fetish, however generally fetishes are acted out within a sexual context often with a partner but sometimes alone. In most cases they will be in private, although there are of course exceptions to this (e.g. exhibitionism). If it's something which she acts out throughout her daily life, rather than in a sexual context, then my first thought would be that it's wider than a fetish.

Fetishes in most circumstances are healthy, safe and fun forms of sexual expression, but in some cases they can have a negative impact on daily life or risk harm in which case further support and intervention may be needed. Is her mom concerned by this? Is she already seeing a professional? You may not know the answer to these things but they could be explored as potential options for her if needed.