Wow, just wow OP. You're coming across as really entitled on your DD's behalf. If not naive, and overly simplistic.
I don't know a huge amount about apprenticeships, but worked in law for over ten years. In every practice, paralegals were law graduates (not any old degree as you imply). All those I met either saw it as a short-term step, having failed to get a trainee solicitor post in order to reapply with experience, or as a long-term prospect.
Those in it for the long-term either did it to see if being a solicitor was for them (minority), or saw it as a first step to eventually becoming a trainee in that firm (apx 2-3 years on), which was carefully researched beforehand.
If your DD at this stage does not have a real interest or passion for law, where she would study for a degree if she is able, a paralegal role may not be for her. It is hard work - often preparing the groundwork for solicitors, and/or having your own caseload. In all honesty, if your DD cannot make these entry requirements a) she probably won't get a place; and b) she might find the work too challenging.
Encourage her to pursue her interests and strengths to start with. If she does go to Uni and gets a degree in a subject she is passionate about, she is bound to do well. If she wants to pursue law after that, there are conversion courses available.
If her grades are less than she hopes, encourage her. There are college, university foundation/entry courses she could try.
I apologise if I misunderstand, but your OP reads as if an apprenticeship and its grades should be second-best, or lesser than a degree. I believe they are intended to be a first-choice alternative, and this is reflected by the grades. London law firms in particular (where I worked) are fiercely competitive (and selective), and able to as the sheer number of applicants for graduate places outnumber places available by several multiples of ten.