Flowering a big mother???

A few questions. In general, do mothers stretch as much as smaller clones?
If a particular strand's clones are put to flower at 12" tall, by the time they're done they are roughly 5 feet tall or around 6foot in their system. My question is what would happen if i put a 4 or 5 foot mom to flower?
Would she end up being through the roof, or would she not stretch too much due to age and size going in? I tried searching for info on flowering mothers but i didnt have much luck...
Also, how in the hell do you change nutes on a bubbler when she turns very big/heavy... The only thing i could think of would be to drill a hole in the bottom side, and connect a piece of hose to a seperate 5 gal bucket bottom side and just use it as an extra res, and simplify changing/topping h20/nutes...
Any help from experienced peaple would be great
Thanks
Peace

anyone???
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i am flowering 2 of my mothers now and on day 14 of 12\12 they are about a year old and been showing sex for like 3 or 4 months now and they have only streatched about 4 inches so far and it looks like its just starting to build nuggets so i figure its about done with the streatch maybe another 4 inches but i doubt they will streatch much more....

At some point they just dont get much taller. Ive got a mother in flower that grew maybe 3" in 2 weeks and i think the pot size may play a big part in that.

put bushmaster in it, it will stop it from getting much taller and give you fat dense buds

or just use lst not normally easy for flowering but if it starts streching should work

Thanks a lot. I guess when i decide to bud her i'll just put her in and see what happens... Worst case, i could always tie it down... The stain is called Williams Wonder. Its a pure indica, but it gets huge, and is very potent... Mom is only 2 or 3 months under 4 4' T5's and in her bucket, and is about 4 foot tall and 3 feet wide, and i had pruned previously about 3 times... Most people i know never heard of Williams Wonder, but compared to say AK47 and OG Kush it is a lot stronger.
How about feeding her though when she's budding? Is it gonna be a bitch in a 5 gallon bubbler? She drinks about 1/2 gallon a day right now...
One other thing i have noticed. In my aero system i run ppm starting at 420 and work my way up to about 980. I noticed in the bubbler it seems like anything higher then 560 previously was too much, and was locking out magnesium when i went too high. But less then 400ppm and she got sulfur deficient... I'm guessing cause she's submerged in it opposed to it constantly flowing...
Peace and thanks for the replies

Oh, one other thing. Over the years a friend of mine did a lot of experamenting with different nutes and we have found that Botanicare is the BEST!!!
Power Plant and Power Flower ROCK, along with a little Blast off. I've used Liquid Karma instead of the blast off and found it to be even better but the damn liquid karma is very expensive, clogs my aero sprayers, and just leaves a residue on everything... Pure blend pro works very well too but i found it to be a little less potent... I dont see a lot of people on here using Botanicare Power Flower, but i swear by it and wish more people would try it...