MY CAR PULLS TO THE LEFT AND ALSO SHAKES/VIBRATES WHEN I DRIVE ON THE HIGHWAY,

Acutally, most of this problem is coming from a bad/failing tire(s). Get the front tires checked first. Then address the alignment. As far as the 'thrust arm'(?)...I think this may be a case of lost-in-translation. If a control arm is cracked, you need to get that car off the road and to a repair shop asap. If you have a tie-rod boot or CV boot that is 'torn' this is not an immediate problem, but still needs attention.

it does need an alignment and it costed my sister alittle over 100 to get her ford ranger done

not an alignment in all cases; could be tires. needs to be checked at a MB specialist NOT a tire store. the trust arm bushing will cause premature tire wear.

if left wheel caster and camber are equal to the right wheel, then you have to check the front setback or trust angle. Thrust angle is caused by miss location of suspension components and also unequal of tyre diameter. measure wether you both left and right wheels/tyre are in square position. you can achieve a zero pulling if:- left and right caster = equal left and right camber = almost zero trust angle of rear and front = zero left and right tyre both in squre position. brake drag = zero if you have two different tyre but equal in diameter, it wont cause pulling, provide that your car has zero trust angle